(at around 1h 15 mins) At the end of the sequence where Kong carries Ann through the forest, there is a very brief scene where you can see that Ann is wearing pantyhose (not invented until 1959, twenty six years after this movie took place). In all other scenes on the island she is barefoot.
(at around 1h 50 mins) After Denham drops his camera and the film falls out, it is clearly a modern tripack color negative and not a 1930's vintage black and white negative. You can tell because of the orange/brown color of the material.
The on screen camera and sound recording gear depicted in the film bear no resemblance to the mass of equipment; mixers, recorders, lead-acid batteries, heavy cables, generators, and tens of thousand of feet of film (ten minutes worth weights 5 pounds) required for a location sound production (even a documentary) in the period the film is supposedly set. Sound cameras were never hand-cranked but instead, electrically driven from the same generator that connected to the sound recorder in order for them to stay in sync. And the sound recorder, then called a sound camera employed a photographic rather than magnetic recording process, which didn't come in to common use until after WWII.
(at around 2h 25 mins) Peggy Lee did not begin her recording career until the early 1940s. Her recording of "Bye Bye Blackbird," used in a nightclub scene, dates from 1955, more than twenty years after the time of the film.
(at around 2h 45 mins) When Driscoll enters the elevator at the Empire State Building during the film's climax, he reaches over to select a floor, revealing that the elevator features self-service. Elevator operators were still employed in the Empire State Building during the early 1930s.
(at around 2h 30 mins) The Yellow Cab Jack Driscoll takes to lure Kong away has license plates dated 1932. The film is set in 1933, so the cab would have been operating without a valid, legal registration.
(at around 11 mins) Before leaving port, Denham tells his asst. to pack "Red Label 80 per cent proof" into a crate labeled "lemonade". At present, Johnnie Walker Red Label scotch sold in the US is 80 proof (meaning 40% alcohol). However, until the late 1980's and early 1990's, almost all blended scotch sold in the US, including Red Label, was reduced from 86 and 86.8 proof (or 43% and 43.4% alcohol) to 80 proof (or 40% alcohol). Though numerous single malts are still 86 proof, from 1909 into the 1980's, Red Label, which is a blended scotch, would have been at least 86 proof. Denham's mistake of saying "per cent proof" is a natural mistake that the character may have made, and may even have been intended by the writers, but referring to Red Label as 80 proof back in the 1930's is a definite goof.
At 44:15 Englehorn tells Hayes to "Check our position. Use the stars." In 1933 that was the only way for a ship's position to be checked with no land in sight. Telling Hayes to use the stars was not needed.
At 46 minutes into the film, when the "Venture", having changed course for Rangoon, goes into a heavy fog bank, the crew is shown as fearful, sensing something wrong. The camera focuses on individual crew members, one by one. When the camera shows Jamie Bell (as "Jimmy" the stowaway), he is sitting on a landing, feet braced against a railing, reading his stolen copy of Conrad's "Heart of Darkness". The shot clearly shows the sole of his boot against the railing as having a deeply lugged Vibram® rubber sole. This type of rubber sole was not invented and patented until 1937, and was designed for mountain climbers, so even had Vibram-soled boots been around in 1933, it is highly unlikely that a deckhand like the character Jimmy would have been able to acquire or afford a pair.
(at around 1h 35 mins) Before Kong picks up Hayes he fires a shot from his pistol, then you see him cocking his weapon back again while he is in Kong's hands. He was shooting a semi-automatic pistol so there was no need to cock the gun again.
Lumpy says 4 men died in the stampede. Actually, at least 5 people died in the stampede; six if you count a deleted scene. Either way, the sixth man is present before the stampede but not when they regroup afterwards, and so can be inferred to have died.
Ann's clothing changes throughout the period on the island when Kong has her; a narrow camisole-strap, a wide flat white shoulder-strap, or the untorn collar/shoulder fabric of her dress are randomly present on her shoulder at various times, and the condition of her clothing changes in how tattered and/or removed it is between shots.
(at around 23 mins) As the ship is leaving its dock in New York the captain orders "dead slow ahead both". This indicates that the ship had two engines and two screws; however, every shot showing the stern of the ship has a propeller wash coming only from the center of the ship, showing that it has just a single screw.
When T-Rex is chasing Ann through the woods she slips and slides down a muddy hill getting mud all over her back, arms and legs. When she gets up she has very little mud anywhere on her body. Then when she makes it out of the woods she is totally clean but her whole outfit is a shade darker.
(at around 1h 8 mins) When Ann is being sacrificed to Kong she is on a greased platform that her bare feet are slipping on as she is struggling. When Jack arrives to rescue her he runs to the end of the same platform. When he reaches the end of the platform he has no trouble stopping.
(at around 1h 29 mins) After the scene with the Brachiosaurus, Bruce Baxter has a conversation with the main character, Jack Driscoll. During the conversation, the rope on Baxter's shoulder disappears.
When Ann and Kong are on top of the Empire State Building near the very end, he sets her down on top as he grows weaker. She begins to stand, pulling herself up on his fingers, the shot cuts and she is standing but his hand is now out of place back towards his body, not near Ann where it should be.
At the end, planes are attacking Kong on top of the building. They stop when they see Ann up there. At one point she is standing, hugging Kong's arm. The camera angle changes to a wide shot and shows her about ten feet away and standing up from a crouched position.
While telling Carl about the shipwreck sailor the crew of the venture picked up on an earlier cruise, Lumpy keeps whittling on a piece of scrimshaw. He continues to do so when Carl is about to leave the galley. In the next shot, when Carl turns back to give a reply, Lumpy's arms are suddenly lowered at his side.
During the whole film, even though Ann is thrown about and man-handled by Kong, as well as sliding down rock and cliffs in bare feet, and falling over numerous times to escape the many creatures and dinosaurs, she ends up with virtually no marks or scratches on her body. Her dress is dirty, but that is about it. Her hair also stays reasonably in place. Surely she would have been scratched and bruised all over her legs and arms from the trauma.
In the scene where the movie star is trying to talk them into giving up he has a rope slung around his chest over one shoulder. He never takes it off, but when he leaves he no longer has it, and Adrian Brody is holding it.
After the running with the dinosaurs scene. Driscoll and Baxter are talking near a swamp. In the first shots of Baxter, he has a coil of rope over his shoulder. We see a shot of Driscoll and when it goes back to a shot of Baxter, the rope is gone. We never see Baxter remove it or see the rope laid down as he walks away.
Shortly after Kong realizes he's been shot and gets blood on his fingers by touching the bloody hole in his chest, in subsequent scenes his chest has no puckered indentation and is unblemished but for minimal straight-line scars.
When Carl falls at the beginning of the brontosaurs chase we see that he is only just in front of the brontosaurs so when he fell he should have been crushed straight away but he isn't. Jack then runs to help him and we see that the brontosaurs only need another step or 2 (which would take 1 or 2 seconds) before they reach Carl and Jack. Carl gets up and argues with Jack for 5 seconds or so by which time they should have been crushed. They then run and there is a far off shot showing the brontosaurs back where they were at the start again.
When Carl and his assistant are driving in the cab discussing who to fill in on the female role, you can see that they pass a tram on their left side. When it cuts the cab is right in front of the tram rather than to its right.
When it cuts to the filming of the first take between Ann and Bruce on the ship, it shows Jack standing on the right side of the picture, about a feet away from the wall of the ship. When it cuts to a close-up of Jack, he is suddenly leaning against the wall.
When Kong is about to fight the last Rex, Ann begins to back under his arms. In a distance shot we see that she is already a fair distance behind his arms, underneath him. Cut to Kong noticing this, then cut back to a back shot of Ann backing under and she has not even reached his arms yet.
When Anne comes out of the lake after fighting with the T-Rexes her hair is all wet, but after Kong has defeated the last Rex and puts her on his shoulder to start running, her hair is totally dry. Same happens after she and Jack crash in the river after letting go of the bat. Next shot you see them running towards the temple and her hair is, once again, completely dry.
When Bruce Baxter tries to wiggle his way out of having to get closer to the brontos so Carl Denham can get his scene on film ("Shouldn't there be a stand-in for this?"), the gun he holds that can be seen pointing up over his left shoulder keeps appearing and disappearing between shots from the front and back.
In the scene where Ann Darrow is brought to the Venture, there is a wide shot where she is walking and observing the ship. On one of the ramps (the closer one to her), there is a man who is carrying something up the ramp. In the next shot, if you look at the ramp he was on, he has disappeared.
Soon after Kong grabs Ann for the first time and is playing with her the wide shots show him violently shaking her around, enough to snap her neck or at least render her unconscious, but the close-up shots during the shaking show her being much more gently rocked from side to side.
Before going on board the ship, Captain Englehorn asks Ann if she is nervous while he lights his cigarette. You can see his cigarette remains in his mouth, but when it cuts it's no longer in his mouth.
Kong continues to change size during the movie. The most obvious way to notice this is when his hands are near Ann. When Kong first finds Ann in NY, his hands are 3/4 the size they are immediately after when he picks her up.
When Kong is at the top of the Empire State building we see Ann start to climb the ladder and she is only a few rungs up when the camera view changes. When it cuts back to her, she is still climbing those first few rungs.
In the scene where Jack Black and Adrian Brody are talking on the boat (as it's getting ready to leave), when the camera is focused on Jack, the cityscape behind him (through the window) is moving (as if the boat has started moving), but when it focuses on Adrian, the cityscape behind him (through the window) is not moving.
When Ann is dancing in New York while King Kong is enchained, her hair is straight and then curly in the ends. But when she goes out in the streets and sees the Kong poster her hair is wavy. When she finally meets Kong again her hair is back to straight and curly.
As Jack Driscoll flees Kong in a yellow cab through a narrow alley, the view through the (missing) windshield shows a pedestrian in light-color overcoat crossing leisurely at the other end. When the car eventually emerges in the immediate next shot viewed from the sidewalk, that particular pedestrian simply disappears.
When the crewman receives the message aboard the Venture, he jots it down on a pad of paper. There is nothing under the pad in one shot, but in the previous and following shots there are more papers under the pad.
At the end of the chase through the streets of NYC, Kong stops the yellow cab with a "karate chop" to the front-end, which sends the car tumbling high into the air through a complete somersault before it lands back down. Actually, Kong's hand is still half way down and nowhere near touching any portion of the vehicle when its rear-end gets lifted.
When Kong falls through a portion of the circular observation deck at the top of the skyscraper, he crushes the metal siding as well as one of the metal girders, making a large hole. When he puts Ann inside through the hole, the metal girders are now all undamaged. You can tell that this is the same hole because the camera moves around the entire building in the next shot and there are no other large holes.
Just before the wall is spotted, Jimmy is in the open crow's nest reading "Heart of Darkness". He puts the book down and stands up. In the next few shots, the book has completely disappeared. Then the ship takes a pounding for 3 or 4 minutes. But a few minutes later there's Jimmy, once again reading the same book.
about 2:40 - as the biplanes circle, Kong leaves Anne on the last platform before climbing the final section of tower. From a long shot we then see Kong half-way up the final section. We then return to a close-up with Kong still on the last platform.
(at around 2h 30 mins) When Kong is chasing Jack Driscoll, you see a shot of an alleyway with a woman in white walking across the alleyway. The camera cuts to the opposite end of the alley, and the woman has disappeared.
(at around 1h 43 mins) The T-Rex is chasing Ann Darrow with a medium-sized monster, possibly a raptor, in its mouth. The T-Rex tosses the raptor to the side and in the next frame or two, the raptor is again in its mouth.
(at around 1h 24 mins) During the brontosaur jostling scene in the canyon, Bruce Baxter's character is threatened by a velociraptor standing just above his head. Seen from above, Baxter's reaction is to turn to his right, yet on the next shot we see him turning to his left.
(at around 1h 17 mins) After forbidding Jimmy to join the search party for Ann, Hayes discovers Jimmy with the party by pulling off Jimmy's hood with his right hand. But, on the next shot, Jimmy's hood is pulled off by Hayes' left hand.
When the sound engineer says "We're gonna have the ship's engines all over the dialogues", he has his left hand to his headphones. When it cuts his hand is gone, but in the next shot his hand is back on the headphones.
Carl is talking to Ann in a restaurant. He asks her if she's a size 4 and she moves to stand up. In the background is a waitress walking toward them. As she stands, the camera changes and the waitress has disappeared.
In the scene where the boat is leaving NYC and the camera is panning around it - the smoke from the ship "follows" the camera by always pointing to the right relative to the camera view; even though it should be trailing backwards, opposite of the ship's direction.
When the main characters first arrive on the island and are attacked by the natives, one of the natives attempts to decapitate Carl but Englehorn arrives at the last minute and saves him by shooting the native three times. As he is falling, it is very noticeable that there is not a scratch on him. He never bleeds at all, there is not even an entrance hole for any of the bullets.
When Carl is convincing Ann inside the diner, after she stands up and Carl convinces her to accept the role, there's a waitress behind Carl about to walk towards her. A split second later, while Carl says "she's the saddest girl he's ever met", the waitress appears 12 feet away, and is now behind Ann way at the end of the diner.
(at around 2h 50 mins) When Jack Driscoll goes up in the Empire State Building elevator, he watches an old-fashioned dial-and-arrow indicator as it sweeps upward through the floor numbers, from "1" to "101". However, the building's structure does not allow for direct elevators from street level to the very top. The metallic tower topping the limestone façade above the 86th floor observation deck is served by only one small elevator shaft and one narrow staircase - that's all that will fit. A change of elevator is necessary on or about the 86th floor for anyone going to the very top. Also, the top floor is officially "102", not "101".
With all the ice and long coats during the New York City scenes, one would assume that it was winter and cold. Unless Ann has hidden blubber or fur, she probably would have gotten severe hypothermia or, at least a really bad case of frostbite.
As with a lot of "dinasour" movies (e.g., Jurassic Park), this shows dinos eating from a large carcass stop to chase a small, moving prey like Ann. No predator would stop eating readily available food to waste energy chasing something smaller. That would be like a lion feasting on a wilderbeast stopping to chase a meerkat. At most, it would roar at the kat to scare it away. This is particularly incorrect when the one has a full body of a dead dino in its mouth and is chasing Ann, who would be equal in size to the hand of the dead one it has.
(at around 18 mins) In one scene, it is shown that there is a name of the town of 'Surabaya' (Indonesia) under the name of S.S. Venture. Some people have noted that it was still written as "Soerabaja" in 1933, but in fact the spelling "Surabaya" was already accepted in English at that time. (source: The Times of India New Standard Encyclopedia and World Atlas, 1936)
Given the presence of snow and people wearing heavy coats in the streets of New York City, it is very unlikely that Ann would have survived climbing to the top of the Empire State Building while wearing a sleeveless white dress. She would have died of hypothermia within the first few minutes.
Carl Denham tells the board of directors and Jack Driscoll that Skull Island has never been seen before by humans. However it is likely the person who made the map either lived on the island or more likely discovered the island. So technically Carl would had lied the island was not discovered.
(at around 1h 11 mins) When Ann "meets" Kong for the first time she is bound securely with some very large pieces of rope around her wrists. Kong hoists her up her waist, snapping the ropes very easily. Given the size of the rope this would more than likely rip her arms completely off (or cause her serious injury). (Unless the natives were really bad at knot tying.)
(at around 1 min) At the very beginning of the film, during Al Jolson's song, the camera looks down on a bridge with lots of cars passing it. On the right side of screen, an animated plume of smoke from a chimney is frozen - on the left side animation is working correctly.
After Ann refuses to perform more tricks to amuse Kong the latter in anger punches the ground twice in front of her. The pounding should had caused Ann to lose her balance and make her fall as Kong's punching would cause the ground to vibrate due to the size of his hands.
When Ann is juggling for Kong on the cliff edge she starts juggling at one point. If you look closely, you can see that she is simply moving her hands, and the rocks have been added digitally. This is most obvious when she leans right back, and the rocks don't match her hand movements at all.
(at around 24 mins) When leaving New York, a 360 degrees shot is taken of the boat by night. However, the shape of the plume of smoke coming from the chimney does not change with the camera's point of view.
Near the end of the film, when people are running in terror out of the theater and into Times Square, you can see that the people are not leaving any footprints in the snow. The snow must have been digitally added to the scene.
When Carl is standing next to Kong's unconscious body saying, "His name will be in lights on Broadway," look at the Venture in the background. Even though it's not stuck on anything, and despite the choppy waves, it doesn't move ANY. Even if anchored, it would still bob gently in the waves; instead it's frozen solid. Obviously green-screened, or possibly a matte painting.
The crew is sailing to the island and the rough sea makes the boat move violently. Jack Driscoll stumbles but the things in his cabin don't move at all, or at least don't cause the chaos they should. Obviously the only thing moving is Jack and the camera.
When they are all running from the dinosaurs you can see where they should have been crushed by the massive brachiosauruses. Also when they are running along the collapsing mountainside they are somehow able to float along as the ground is giving way.
(at around 2h 45 mins) When Kong is on top of the Empire State building, and is shot by one of the bi-planes, you can clearly see two bullet holes and blood coming from his chest. The wound immediately disappears.
(at around 2h 55 mins) When Kong falls off the Empire State Building at the end, the ladder on the side of the Empire State Building's dome is in front of Ann, below Kong's chin. But when Kong falls off we cut to a rotating shot from above as Kong falls down, and the ladder is gone. Then Jack climbs up the ladder behind Ann.