After Strabo falls down the stairs strapped to the chair, the rope is clearly not tied around his wrists anymore. When he walks back up the stairs his hands are once again securely fastened by the white rope.
When Jill is about to shoot Jimmy as he is tied to chair, in one shot you can see Cynthia's hair on his right shoulder (as if she was still tied up next to him), after she and Oz have been released and are standing across the room.
In the opening scene, Laszlo Gogolak is writing notes. The close up shots show a left handed person writing but when the camera goes to a full body show, Laszlo Gogolak is holding the pen in his right hand.
When Lazlo tears the bill apart in the beginning of the film, the tear forms more or less rectangular pieces. The pieces, which were put together in the end of the film, are triangular and the tear meets exactly the corners of the bill, what was actually not the case as the bill was parted.
Oz is outside his home on the phone talking to Gogalack, while Jimmy is standing by the car, Jill is sitting on the trunk of the car, and Strabo is in the trunk. In between shots, Jill is standing next to Jimmy, and then back on the trunk.
When the Buttercup Scout is at Oz's door, she calls Oz a "putz" and Cynthia turns to put the gun down. Next shot is a close up of the Scout calling Oz a "jackoff", and in the next long shot, Cynthia turns and puts the gun down again.
When Jill and Oz talk on the phone near the beginning of the film, Jill hangs up at the end of the conversation. In the next shot, which is of Oz, you can hear Jill's voice, and if she were still on the phone.
When Jill is holding up the dollar bill to Laszlo, the same side is shown in both directions. i.e. the side that says "One" in the center is seen from Jill's point of view in one shot, and then from Laszlo's point of view in the next without Jill ever turning it around. The side with Geaorge Washington is never seen although we see both sides of the bill.
After Jill shoots Jimmy and Laszlo takes the gun, you can see that the hammer is down. On this type of automatic weapon the hammer is automatically cocked as the slide goes back when it chambers a new round. Jill never de-cocks the gun, so the hammer should still be back.
Before Strabo falls down the stairs, his hands are tied together and his arms are tied to the chair. As he falls, the chair breaks and his hands fly apart so he can control his tumble backward down the stairs. Afterward, his hands are tied again.
When Jill, Jimmy and Oz pop out of the wood pile and head for the car, Jimmy and Jill are shown in the car with the backseat empty. But when Oz leaps into the car, their black travels bags are in the back seat.
In the last scene in Oz's dentist office the coat rack gets knocked over. Oz returns only the white coat to the rack, and you can see the other side of the rack is empty. In the next shot, the brown coat is seen hanging on the opposite side of the rack without Oz ever having put it up there.
When Oz, Jimmy, and Jill are at Oz's house and the hit man is shooting at them, Jimmy hot wires the car because Strabo has the keys in the trunk. When they arrive at the hotel, Jimmy turns off the ignition.
At the beginning of the film, when Jill is describing her attempted hit at the hotel and the things that went wrong, the camera cuts back and forth between Jimmy/Jill and flashbacks of the attempted hit. In all the flashbacks, Jill is shown to have brought a shotgun along as her weapon, but in one very brief cut, she turns around and is holding a semi-auto handgun in both hands, and then less than a second later, she's holding the shotgun again.
When Jimmy and Oz are talking at the bar, in one cut Oz is holding a bottle, then the bottle is back on the table in the next cut as he is covering his face in pity towards Jimmy, then back in his hands again in the following cut.
When Oz, Jill and Jimmy talk in Jimmy's house, the height at which Jill holds the towel changes between shots. We see her pass the towel from her right hand to her left but in the next shot, the towel is in her right hand. Then back in her left hand.
When Oz, Jill & Jimmy have dinner at Jimmy's house, the weather is nice and calm. Just before they leave the table, all the plants are blowing around in a 5 to 10 knot wind. And outside where Lazlo and his gang are the weather is calm.
When Jimmy, Jill and Oz drive away from Jimmy's house, the car is very dusty (dirtier than when Oz arrived). By the time they get into town the car is shiny clean. Later when Lazlo is by the car, it is very heavily covered in road dust. And then it's shiny when it arrives in LA.
In the Blue Room bar there's a bearded man in a blue shirt behind Jimmy. Initially only he is visible. Then a female companion appears out of nowhere. She blocks our view of the lamp previously seen on her table. Then she disappears.
When the cast first arrives at the Pink Motel, they begin walking together and arguing about the cross that Jimmy wears. Oz's tie begins to turn backwards, blown by the wind. Then his hand hits it and it is totally reversed. In the next shot it has returned to a normal position.
When Jill attempts to seduce Oz, she removes her bra. Oz grabs a purple shirt from the closet and tosses it to the floor. The camera changes from Oz to Jill and back to Oz. The purple shirt is back on the hanger in the closet. Then, when the camera changes between the two characters again, the shirt is again missing from the closet hanger.
As Strabo is making his escape out of Oz's house, his hands are still tied at the wrists. The camera cuts to another shot. When the camera comes back to Strabo, who has made his way to the trunk of the car, the rope around his wrist has disappeared. It should be noted that he was struggling to get the rope off, and it was a short distance between the house door he exited and the trunk of the car. So there was not enough time for him to have worked off the rope in the short amount of time it took him to get to the trunk.
When Oz is brushing his teeth, just before someone rings the doorbell he puts the tooth brush in his mouth. After the door rang a second later and he startles, we see a zoomed out cut where he has his tooth brush in his hand.
Jimmy jumps in and starts to drive the Buick after hot-wiring it. Although many modern day cars can be hot-wired, they still have a steering column lock. Jimmy would have to either have the key to unlock it, or break the mechanism in order to start it.
When Jimmy is arguing with Jill in the hotel room, Oz tells Strabo that Jimmy killed 21 people. In the first film, Jimmy is reputed to have killed 17. By the end of the film, he has killed Janni, two of his goons, an undercover cop, and Frankie Figs. That would bring his total to 22.
Lazlo and his henchmen transport their guns in suitcases with inserts to block X-rays with normal luggage items on the outside. An X-ray works by penetrating the target from one side to the other with certain materials absorbing more or less of the X-rays, giving you contrast. The inserts would prevent the X-rays from making it through at all, meaning the image would be blank.
In the first scene at the Gogolak's hideout, when Lazlo goes to put the dollar fragment into the painting, the video is played in reverse. The ash and smoke from the cigarette go towards it, instead of from it.
When Oz and Jill are in the utility room to collect weapons the first gun Jill picks up is a H&K MP-5. She waves the heavy machine pistol around like a lightweight plastic toy gun which of course it is. There is another identical weapon hanging by the trigger guard from a screw or nail on the wall in the background the way a professional hit man would obviously store a very expensive tool of the trade. Storing an arsenal of guns directly above the washer and dryer in a humid laundry room is just bad set decorating/negligent film making.