(at around 14 mins) Near the beginning of the film, when Castor Troy turns round and sees his brother Pollux Troy being pinned down by cops, the camera zooms in on Pollux's face as he shouts "CAS!". However judging by the lip movement and expression of Pollux, it's obvious that the word was dubbed over the video.
(at around 1h 2 mins) After Castor (as Sean) defuses the bomb, the display shows two seconds remaining. The news reporter states that he defused the bomb with one second remaining to create suspense, significance, and to portray Sean as an even greater hero.
During the hangar shootout one of Archer's federal agents is killed with a shotgun blast (we get a good look at his face), yet a few moments later you notice the same agent is standing, alive and well.
(at around 34 mins) When Castor Troy (C. Troy) and Sean Archer (S. Archer) are having their faces switched in the laboratory, the monitor for Castor Troy shows his name as "T. Castor". When in fact it would read either "Troy. Castor" or "Troy. C". Hospitals/ Institutions always record patient details as: Surname. First Name / Initial.
(at around 38 mins) Just before Sean (as Castor Troy) goes to Erewhon Prison, his friend Tito says there are 6 days until the 18th, when the bomb is supposed to go off. Just before that, though, there's a shot of the bomb that says there are 216 hours until it explodes. Tito could have meant six days after Sean got out of Erewhon, the bomb would go off, but Sean is supposed to be in Erewhon two days, which means the bomb would go off in a maximum of eight days. 216 hours, though, is nine days, not eight. That clarifies the meaning of what Tito said, but the time frame is still incorrect.
(at around 2h 5 mins) In the last scene where Archer (as Castor) is fighting Castor (as Archer), Archer screams in pain when Castor hits him, but it's Castor's voice. In the previous scene, the microchip in his larynx was dislodged, so he spoke as Archer again.
When Castor Troy is captured at the beginning of the movie, he is clearly in possession of his famous twin 1911 gold-plated gun, yet later, when Archer goes to Dietrich's apartment, Dietrich gives him the same guns.
(at around 21 mins) After they receive Archer in the office with applause for catching Castor, he checks the computer for his son's file. It states he was murdered on Sept. 9th, 1991. However, later in the movie (at around 1h 14 mins), when they go to the cemetery on Michael's birthday, the grave states Sept. 24th, 1991.
On his own computer, Sean looks up his son's file, which states the boy died immediately and his date of death was September 9th, 1991. When Eve and Castor (as Sean Archer) are at the cemetery, the date of death on the headstone is September 24th, 1991.
(at around 9 mins) On the plane at the beginning of the movie, Castor (still Cage) passes his drink to his left hand when the stewardess sits on his lap, however, a second later he's putting a cigarette to his lips with his left hand, and the drink is back in his right.
(at around 2 mins) In the beginning of the movie, Sean Archer is sitting on the merry-go-round with his son, Michael, and the bullet goes through Sean's chest and into Michael's head, shown by the amount of blood that seems to be dripping from Michael's forehead. Later in the movie (at around 21 mins), though, a summary of Michael's death shows that the bullet was through his chest, not his head.
(at around 1h 11 mins) Just before Dubov gets shot by Walton, we see Burke Hicks running up to Walton to try to stop him. A few minutes later when Dubov falls down and Walton tries to shoot Castor, Burke Hicks runs up to Walton again.
(at around 6 mins) Just after Castor Troy activates the bomb in the LA Covention Centre, he walks behind a choir girl, says something to her, then grabs her hair, in the first shot we see of them she has a bit of hair hanging down next to her ear, but in the next shot, Castor has all of her hair in his hand pulling it back from her face.
(at around 44 mins) When Archer (as Troy) is fighting with Dubov in prison, he hits him several times with the metal tray. Before Archer hits Dubov, he is hitting him like a left-handed baseball player, but after impact the camera switches angles and he continues through the hit as a right-handed baseball player.
(at around 12 mins) After Sean Archer gets into the helicopter to chase Castor Troy, Castor fires three times from the plane at the helicopter. In the next shot there are four bullet holes in the windscreen.
(at around 1h 35 mins) When Pollux falls through the skylight, we can see glass shattering but in the shot where Troy (as Archer) is shielding himself from the glass, all we see is Pollux's body falling and no glass.
(at around 2h 10 mins) When Archer and Castor are lying in the stretchers after Castor has been killed, there is a lot of blood on the collar of each of their shirts. in the next scene the blood pattern changes so there is almost no blood, but in the scene immediately after, the blood returns. This is evidence that the shirts were changed during the filming.
At the end of the film, when Nicolas Cage and John Travolta are lying next to each other in the ambulance, there is no blood on Travolta's shirt collar and suddenly, between shots, the collar is covered in blood.
(at around 13 mins) During the shootout in the hangar, Castor Troy jumps out of the plane twice.
This is no mistake. It shows, that Castor is able to shoot more than one Cop/Agent while dodging out of the plane. So the jump is shown twice and it is noticeable, that Castor is a little bit further away from the door of the plane, as in the scene before.
(at around 38 mins) At the Walsh Institute, after he gets the face transplant, Archer is told that the bomb is set to go off in 6 days; however, the subsequent shot of the bomb shows 216 hours (9 days) on its timer.
(at around 1h 11 mins) When Dubov falls over the hand rail after getting shot, Archer (as Castor) holds onto the barrel of the gun and his hand is slipping. His hand clearly changes position on the barrel between different camera angles.
(at around 2h 5 mins) In the boat chase scene, we see Troy (as Archer) take a swing at Archer's face (as Troy) with the anchor, miss, and leave a hole in the boat. In the next shot, the part of the boat where there is supposed to be a hole, is perfectly smooth.
(at around 20 mins) When Sean Archer is holding the bottle from the CIA, he holds it at the base of the bottle in the quick shot while he is walking around his secretary but in the closeup shot of him putting the bottle down, he is holding it at the top.
(at around 1h 9 mins) During Archer's escape from Erewhon, the computer screen that flashes Castor Troy and Dubov's names also displays Pollux Troy's name in the same list. However, Pollux Troy had already been released and is no longer an inmate at Erewhon.
(at around 1h 11 mins) When Dubov falls over the hand rail after getting shot, he initially falls backwards. Then when the scene cuts, before he is caught by Archer (as Castor), he's falling over the hand rail forwards.
When Sean and Tito first drive the Hummer onto the runway, the jet is a mere short distance away, coming towards them. In the following shots, the distance between the Hummer and the jet has increased tremendously, for the ensuing drama to unfold.
On the speedboat, when the anchor comes loose from the boat's bow it takes with it a large chunk of metal and leaves a gaping hole, but next shot, as the anchor falls to the water, the huge hole is gone leaving only the bullet holes on the surface.
On the chopper, when Sean Archer points his gun out the window, in the shot facing him the window to his right is a double slide type. In the next shot, from inside the chopper, his arm is through a single window that flips down.
When Castor (as Sean Archer) is speared, as he stands there singing morosely his shirt is drenched in blood, but when he is next seen in the ambulance that blood on his shirt has vanished. Additionally, the cuts on his face produce blood trails which smear, when he is first speared, but in the ambulance his face is cleaned up and the blood trails are thin and neat.
When Archer and Dubov are making their escape, Dubov falls over the rail and Archer catches his gun barrel then tries to save him. In the last shot before Dubov falls, Archer is holding on to the very last tip of the gun, but in the wide shot he is holding a lot more of the barrel.
After being told that Pollux was released from prison, Sean Archer (as Castor Troy) shouts that he's Sean Archer, then grabs hold of the bars above him, with three bars between his hands. Next shot, as the guard's foot is on his hand, there are only two bars between his hands before he lets go.
At Erehwon prison, during the cigarette incident, Sean (as Castor Troy) is knocked down, and while on the floor the side bar of his left magnetic boot breaks and the entire boot begins to fall off, but it's intact when he crawls to get the cigarette.
After the jet crashes into the hangar, Sean Archer runs up the back end of a police cruiser, whose three blue flashing lights are completely shattered. In the next shot facing him, when he reaches the car's roof, two of the blue lights have repaired themselves.
After Sean looks up his son's file on the computer, and types "case closed" on Castor's file, he rubs his head with his right hand in the close-up, but next shot he is rubbing his head with his left hand.
At the airport hangar, after Castor reloads, in the close-up Sean is kneeling beside a crate with a large black/white SCI air freight sticker. In the overhead shot, when Castor Troy aims the gun at Sean, the sticker is gone. Debris also disappears.
At the hangar, when Castor Troy is blown backwards in the turbo tunnel he hits the wire gate, and the metal bar, about 3-4 ft long, breaks off and begins to fall with him. Next shot, he lands on the floor, but the long bar does not. It just disappears.
When Castor Troy (as Sean Archer) says, "Every time you'll look in the mirror, you'll see my face," he proceeds to cut his face. The first cut he makes is straight down the side of his right cheek (viewer's left) and later that cut is curved and closer to his nose. This may appear to be a mistake at first glance; however, Castor's facial expression is different in the two images. When he made the cut, the cheeks were pulled away from the nose; in the second photo, the muscles are relaxed, moving the cut closer to the nose.
At their home, when Sean tells Eve that he has one last assignment we see his scar. At the Walsh Institute, before the surgery, there is another close-up of the scar, but it differs from the previous shot.
At the airport hangar, when Castor hits the wire gate in the turbo chamber, the top of his head is well below the metal bar. But, when the emergency shut-off is pressed, his unconscious body has sat itself up, because now the bar is at shoulder level.
During the runway pursuit, there is a shot from behind Castor Troy as he fires on Sean's chopper, and there are four bullet holes on the windshield. In Sean's close-up the four bullet holes change position.
At Dietrich's, when the firing begins, Sasha grabs a woman and they both start running up the stairs, but a few shots later when Sasha yells, "Cas, be careful with him," she and the woman are still downstairs.
When Jaime is screaming, Castor Troy (as Sean Archer) walks out to the front yard and the back tires/end of Karl's car is on the sidewalk, but when Karl is dragged out, the car is farther up the driveway.
After the surgery, when Sean (as Castor Troy) breaks the center mirror of the tri-fold mirror, what remains are the two side mirrors and white backing within the center frame. When Tito grabs him as he starts cursing, in these close-ups the reflections seen are as if all three sides are still intact.
During the speedboat chase, when Castor Troy (as Sean Archer) shoots up the white speedboat that Sean (as Castor Troy) drives, there are numerous bullet holes on its starboard side. Four shots later, when he hits the box on the rear seat, those bullet holes on the starboard side are gone.
When Cage is rolling down the runway he appears to be controlling the direction of the aircraft by turning the yoke. An aircraft is controlled on the ground via rudder (vertical stabiliser) controlled by the feet of the pilot, and nosewheel steering, also controlled by the feet (rudder pedals) of the pilot (sometimes also with a steering wheel on the side of the cockpit). Moving the yoke simply alters the position of the ailerons, which will not steer the aircraft on the ground.
Towards the end of the boat chase. The "Coast Guard" boat is facing towards the two boats. A few seconds later one of the chase boats flies through the Coast Guard boat from its rear. It would have taken too much time to spin that boat around for the boat to crash through the back. And even if it were possible, most of the crew were shot and fell off the boat. Who drove the boat to position it for the crash?
Castor Troy puts three bullet holes in the windscreen of the helicopter Sean Archer is in at the start of the movie. When Archer moves toward the hangar to shoot Castor, you can see in the background that there are now no holes.
When Castor (as Sean Archer) grabs the speargun shaft before it can unload, he takes a piece of glass and begins to cut his face. The broken glass has a small circular piece missing from the edge, but from a different camera angle that small piece is more intact than the previous shot.
After Sean types "case closed" on Castor's file, Dr. Miller walks into Sean's office and holds out Pollux's Zip Disk for Sean to take. In the next close-up, the Zip Disk has flipped over and faces the opposite way.
When Castor Troy (as Sean Archer) turns off the video-cam and walks into the interrogation room with Pollux, the Coke has two straws, but next close-up there is only one straw as he turns off the microphone.
When Castor Troy first arrives at the airplane you see another business jet in the back (you see the red engine coverages). Few seconds later there is a different aircraft with a propeller and no jet anymore.
In the scene where Cage and Travolta are fighting on the dock, Cage stabs Travolta with the speargun (before he fires it). If you look at the spear after Travolta is stabbed, there is blood on it. Then in the next shot, the spear is suddenly clean.
At the church, just as the shooting is done with, Eve is leaning down with her hands covering her head. Then, in the close-up she uncovers her head and sits upright to look around, but in the next shot, she's still leaning down covering her head.
During the cemetery scene where they visit the son's grave, you see a wide shot of them walking between the stones. There are leaves on the trees and neatly trimmed grass. When we see a close up of the stone and the plaque in the ground, a hand reaches down to brush the leaves off so they can read it, and there are dead leaves all around - but there were no leaves on the ground in the wide shot.
When Troy (as Archer) arrives home for the first time, he's walking around his wife. When he says her name, his right hand is held up. From a different angle as he moves to her right, his hands are by his side.
In the shoot-out sequence in the Mexican Standoff scene between Archer, Castor, Sasha, Eve, and Castor's two bodyguards. You don't need to look carefully to see that the exact same footage is used twice at different times to show a flowerpot exploding. Also, a bad guy gets shot and falls the exact same way twice at different times. He doesn't even fall at a different camera or body angle. These two mistakes blow by very fast when you see it in normal motion, so it's easier to slow it down to see them.
After the second speedboat explodes, when Sean (as Castor Troy) pulls the speargun trigger, Castor (as Sean Archer) grabs the spear shaft before it can unload. As he grips the gun, the problem is that in some shots the slings are still loaded, but in other shots they are not.
(at around 1h 30 mins) When the swat team begins shooting into Dietrich Hassler's apartment, Archer grabs Sasha and her son, and jump behind the bed. Dietrich is then seen sitting on a couch, as Dietrich stands and begins to walk, a camera can clearly be seen rising behind and to the left of him.
(at around 1h 1 min) Immediately after the motorcycle cop pulls up during the Convention Center evacuation montage there is a wide shot of the frenzied street; in the background a camera crane with camera and operators is visible as it tracks upward.
When Sean first visits the Walsh Institute, he, Dr. Miller and Dr. Walsh walk in front of the circular glass window to view the ear reconstruction. In the next shot facing them, the reflection of a boom operator holding the boom pole is visible on the glass in front of Dr. Miller and Sean.
At the L.A. Convention Center, just before Castor Troy (as Sean Archer) disarms the bomb, there are a few shots of all the extras evacuating the area. In the interior shot, that looks out through the glass doors onto the street, the tracking crane arm with a seated camera operator and camera on its platform is visible as it shoots an exterior crane shot of all the extras, which was seen among the previous shots.
At the Walsh Institute, after Sean gives his ring to Tito, when the stainless steel sliding door closes, the camera and a crew member, or likely the director, looking behind the camera lens is seen in the glass window reflection.
On the runway, two shots after Castor Troy says, "This is a big gun. Fly the f*ing plane," there is a side shot of the Hummer. As the camera pans in closer, the reflection of a crew member on the filming vehicle, which moves beside the Hummer, becomes visible at the Hummer's back end, just before it cuts away.
During the raid at Dietrich's, when Sean (as Castor Troy) hangs on to the chain then grabs hold of Pollux, in the close-up Pollux's safety wire is visible in front of him. (This is not Sean's safety wire, as seen in the following shots.)
When Sean sees himself for the first time as Castor Troy, he takes the coat rack and slams it into the tri-fold mirror. The right side mirror is knocked back, and both the cameraman and camera are briefly visible in the reflection.
When Sean (as Castor Troy) shoots Castor (as Sean Archer) with the speargun, when the spear is finally unloaded, in the side shot there is a thin guide wire pulling the spear tip towards Castor (as Sean).
When the red boat has hit the barrier and Castor Troy and Archer fly through the air, you can see a wire attached to the front of the boat just for a split second, then when it falls in the water and explodes.
When Buzz and Wanda stand in the outer room, in the first shot, the camera pans around and faces the agents' TV, showing the video feed of Pollux in the interrogation room singing about his tiramisu. On the agents' TV screen, the reflection of the crew's rather large black square screen is visible (on a stand) in front of the windows (to block window light and view of the crew/equipment) and just as the camera faces the TV head-on, a crouching crew member begins to stand (seen at the left side of their TV screen).
At about 14 mins during the gun fight after the plane crashes. Stunt cables, harnesses and random stunt equipment is on show. It's not just once either. During an explosion a cable is clearly seen on a guy that drags him backwards through the air. In the very next shot you can see pyrotechnic equipment going off.
(at around 37 mins) After the face surgery, Archer (as Troy) says his voice still sounds the same. Dr. Walsh tells Archer that he's implanted a micro-chip on his larynx, so he'll have to be careful because pressure, a sharp blow, even a violent sneeze would dislodge it. If this was the case, the micro-chip would have easily been dislodged in first prison brawl between Dubov and him (at around 42 mins).
(at around 12 mins) During aircraft chase scene at beginning of the movie, Castor Troy is steering the jet with the yoke while plane is on the ground. Aircrafts are steered by the rudder pedals while on the ground.
(at around 1h 35 mins) Near the end of the raid on Dietrich's place, Loomis busts in armed with a , with an underslung M203 Grenade Launcher. He fires the launcher twice in rapid succession. The M203 is a one-shot launcher and requires reloading between shots. There is no indication that Loomis bothered to reload at all.
(at around 1h 50 mins) In the funeral scene, the flag draping the casket is lying in an incorrect orientation. It is conventional for the union of a United States flag to be at the head and on the left side of the body, covering the heart.
A major medical risk of any transplant is that the recipient's body may reject it (or vice versa, that the transplant rejects the body). Dr. Walsh should have known that the face swap operation may result in severe adverse side effects if Archer and Troy's HLA genotype were not compatible. The HLA (human leukocyte antigen) determines whether human tissue can be transplanted.
Never mind that their faces are taken off (and a fast recovery time, as well), but John Travolta is tall with broad shoulders, Nick Cage is short and thin - how did all this get changed? I know plastic surgery is possible, but these two men would need intensive plastic surgery and would need months or years to recover, not several hours.
In the scene in the hall where there are is a circle of mirrors where Castor and Sean engage in a shootout, there is a mistake as the FBI agent fires at Castor. The FBI agent is holding an M16 or M4 assault rifle with an M203 40mm grenade launcher. He fires two consecutive shots within a second of each other. This is impossible as the M203 attachment only holds 1 shell at a time and would take at least 5 seconds to grab another round and reload and fire again.
Castor steers the jet after shooting the pilot using the yoke(wheel). This doesn't steer a plane on the ground, it only moves the ailerons. He'd need to use the rudder pedals if he wanted to turn on the tarmac.
(at around 1h 45 mins) In Troy's blood test results the word "hematocrit" (or "haematocrit") is misspelled as "hemotocrit". Besides, some numbers (such as the white blood cell count or its reference range) are clearly made up.
Only Dr. Walsh, Dr. Miller, and Tito were set on fire in the lab. Dr. Walsh knew Sean and Castor by name and by their face, the other assistants who helped during surgery weren't told anything about Sean's mission.
(at around 40 mins) The Geneva Convention regulates the treatment of victims and prisoners of war, not criminal prisoners of society. The guard makes a reference to the Geneva Convention simply to intimidate new prisoners and give the impression that the prison guards are not limited to any domestic and international laws that protect mistreatment of prisoners.
(at around 1h 55 mins) In the shootout at the church, Sasha didn't realize that "Sean" is actually Castor when his gun was pointed at "his own wife" and his henchmen are not pointing their guns at him but at "Castor, " because she was more focused on preventing from Castor from getting killed as she promised she would.
Archer's wife doesn't notice her husband's body is entirely different when they make love. Also the film doesn't explain the change in eye color, teeth and height. When Archer visits the Walsh Institute, Dr. Walsh explains every step of the process. Archers body will be adjusted in every aspect to match Troys. This will later happen with Troys body to match Archers figure in every detail.
On the runway, when Castor arrives in his car, he is wearing three gold rings - one on his right hand (ring finger) and two on his left (pinky and middle finger.) In the plane, a clear shot of one of his hands shows that he is wearing a ring on his pinky only. Whichever hand this is, right or left, it is inconsistent with the previous scene. This isn't true. Castor wears all of his rings the whole time in the plane on exact the same fingers. The closer shot of his right hand shows, that the ring is still on his ring-finger and his middle-finger slipped slightly under his index-finger, while still holding one gun in his hand. So a quick view could imply, the ring is on his middle-finger now.
At around 1:38:00 Castor (as Archer) says "I don't know what I hate
wearing worse: your face or your body." but they only swapped faces. They also adjusted the rest of the body to match the other persons measurements. This whole process is explained by Dr. Walsh the first time Archer meets him and sees Troy still living.
(at around 53 mins) The choking that Archer gave Troy during the visitation scene should have been more than enough to dislodge the microchip in his larynx, therefore preventing him from talking in Archer's voice for the remainder of the film.
(at around 1h 35 mins) During the raid on Dietrich's apartment, Archer (as Castor) grabs a FBI SWAT member and says "Buzz" as he remembers him, however at that exact point, Dietrich is seen behind Archer's right shoulder. Archer makes out that he "killed" the SWAT member, but Dietrich saw Archer compromise his cover and then fire one round into the floor.
When Castor sets the bomb it is set for 236 hours (just about 10 days) after the initial surgery, there is a shot of the bomb indicating it was about 216 hours. There is no way that the surgery and subsequent healing process, in addition to the chase, capture, interrogation, etc. that took place in such a short interim.
Though it was "corrected" the issue with Dr. Walsh's assistants knowing about the switch remains a plot hole. Even if they were told nothing about Sean or his mission, they would still likely recognize Castor, a notorious, high-profile fugitive, and they'd recall putting his face on another person, especially when the supposed one-of-a-kind facility at which they performed this operation later burns down (with Archer's face presumably lost in the fire). Furthermore, Castor would not presume they were totally oblivious to the aforementioned details. He'd want the assistants killed off to avoid any pointless risks.
In spite of the "correction", Dr. Walsh's explanation of how Castor and Sean's differing bodily measurements will be altered to imitate each other also remains a plot hole. He does nothing to explain how a facial transplant will adjust the skin, hair, and eye color of the recipient to match the donor's, essentially changing the recipient's DNA. As stated already, any surgery that alters a person physical measurements, which requires changing one's bone size and muscle mass, would require extensive recovery time, assuming it was possible to do so without crippling the person's motor skills. Lastly, if the two men retain their own blood types, wouldn't they also retain their own fingerprints? Prints are possibly the most unique feature of every person, and would readily expose who was really who.
While it is possible for someone with type O blood to donate to anyone, they can only receive type O blood or tissue. Similarly, anyone with type AB blood can receive from anyone, but can only donate to type AB. Sean's blood type was O, Castor's was AB. Thus, While Castor could take Sean's face without rejection, Sean could not do the same.
It would have been a lot simpler to just drug Pollux with Sodium Pentathol, or truth serum, and learn the location of the bomb that way than go through the whole surgical process that has many avenues of failure.
(at around 46 mins) When Castor awakes from coma, he starts taking off the bandage. He's not supposed to have skin on his face, but in one shot, he still has it on forehead and on the left side of his face.
(at around 17 mins) Obvious stunt double when Castor Troy is thrown against the fence (and knocked out) when he is thrown behind the jet engine during the airplane hangar sequence during the beginning of the movie.
(at around 1h 40 mins) After Pollux falls through the skylight, Troy (as Archer) is visibly upset. When Loomis enters the room, you can clearly see the "bullet hole" covered up on his forehead; it is also visible when he says "It's just Pollux Troy" and Troy shoots him in the head, exactly where the makeup-covered mark is. You can see it explode with the impact of the shot.
(at around 56 mins) When Castor as Archer reads Eve's journal the latest date reads the 17th which would put it the day before the bomb at the convention center was to explode. But as he reads it, the text states the Archer had come home after catching Castor and told her that he had to go back on assignment. The events described would actually have happened on the 7th, according to the movie's time line.
The helicopter broke off the Aileron instead of the Horizontal Stabilizer (Pitch Control). The jet still can take off with broken aileron but not advise to do so since it is dangerous in the air. The aileron control the turning but the experienced pilot can control the yaw with left and right engine power output.
In the big speedboat scene near the end, when Cage is hanging off the side of the boat the stunt double is obvious in wide shots, where the entire boat is visible from above. He has big long sideburns, which are in stark contrast to Cage's short hair, visible in closer shots. At various other points in the movie, stunt doubles appear of much different physical builds than the two actors, with markedly different hair colours, and I seem to recall that at least one of them had facial hair.
When Loomis comes upon Castor grieving over Pollux's body and says "Sir, why are you so upset? Its just Pollux Troy", you can see discoloration of a lump on his forehead which is makeup covering the blood pack where Castor will shoot him.
In the scene when Castor Troy kills Agent Winters the sky is blue. There is only one cloud just above the fuselage. This cloud doesn't move, at least not that fast as it should as the jet is near take-off speed. The aircraft stands still when the actress falls out of the jet. In the ensuing shot, when the dummy falls out, the sky is overcast and the aircraft moving again.
In the hall of mirror's, Travolta runs behind the mirrors in order to get the drop on Cage. Cage starts shooting, but when he stops and lowers his arm the muzzle flash (and possibly the gunfire as well) from his gun continues as if he's still firing.
Just as the red speedboat heads toward shore, before it crashes, the white and red truck cranes are on the dock and the white crane arm is angled backwards over the dock. In the shot facing the speedboat, as it explodes, that crane arm is now angled the opposite way, over the water, since it was used in the stunt.
At Erehwon, Sean (as Castor Troy) is given steel magnetic boots to wear, for the prison's important security feature. There is a close-up of these heavy duty boots during his 'exercise'. Then, when he is taken to the clinic there is another close-up, and there are a number of changes to the boots style. More importantly, one of the side "bolts" has fallen off, revealing that it was merely glued on the prop boots.
When Castor is pushed into the blowing heat from the plane engine by Sean and is thrown back, the man that lands against the grill is so obviously the stunt double; he has a different hair cut than Castor and really doesn't look anything like him.