Other mistake: In the Super Bowl, both end zones are painted with the Vikings logo (you can see the far end zone as they go to kick the game winning field goal). One end zone should bear the Bills' logo.
Continuity mistake: After his arrival at Hawaii Barry calls his sister from a phone booth to ask her for Lena's hotel and phone number. From the side we see two men standing next to him, but between shots these two men get replaced by two women. (01:01:35)
Continuity mistake: Right after Paul goes home with the doctor, the doctor and his wife are clearing the dinner table talking about Paul staying at the house. The wife turns to the dinner table and is holding 2 napkins. The camera angle changes and the wife is now seen walking 2 glasses over to the sink.
Other mistake: When Arnold and Gerald first bump into Helga at the bus stop, they ask her for bus money, but throughout the rest of the movie they never need bus money.
Factual error: When the upset boyfriend ends up driving off the cliff, his car explodes into flames magically and the fire doesn't even start at the engine. The entire interior of the car is consumed and when the car crashes, its explosion is on par with a missile. The character, when seen next, doesn't have a burn on him at all ignoring the fact that there was no humanely possible way to survive that fall and explosion.
Continuity mistake: At the start when Pistachio's dad is in the car, you see in the background that they are on a road, but when you see a wider outside shot, he isn't driving on a road.
Continuity mistake: In the scene where White She Devil is pursuing Undercover Brother on a motorbike, her helmet changes from one without a visor when the shot is a close-up her face, to a different helmet with a visor when the shot is from further away.
Continuity mistake: In the scene where Christina decides not to be afraid anymore and runs after Peter, she comes out of the house and first shouts while facing in the wrong direction. She knew that he went the other way, because she saw him leave. (Shot at different times, confirmed on DVD commentary.) (01:19:25)
Continuity mistake: When Lanie is talking to her sister at her sister's house, they are seated across from each other on sofas. Her sister has a plate of cookies in front of her on the coffee table. As Lanie and her sister are talking and her sister gets up towards the end of the scene, the plate of cookies have moved across the table in front of Lanie.
Continuity mistake: When Davey Stone is running away from the police while singing, after he says, "But I'll give this old lady's melon's a squeeze.", he swings around a street pole. The garbage can lid he is riding on has no handle, but when he slides down the hill and jumps over the front of a snow plow, the lid has a handle.
Continuity mistake: About 35-40 minutes into the film, Jules and Jess are at the bus stop. Pinky's future in-laws drive by in the Jaguar with nothing in front of them. When the camera shot moves back as they enter the bend, another car has appeared in front of them.
Audio problem: In the beginning when Davey is burping, the sound of the peoples' glasses breaking is a little early.
Factual error: It's very nice that the Kate and Jonas clones came out looking exactly like the originals, but the DNA doesn't contain information about the hair length and exact haircut (and mustache, in Jonas' case) at the time of the replication. They would never come out exactly the same.
Continuity mistake: When the thumbs are in the car driving to the woods, in some shots their thumbs are out of their shirt a lot, but in other shots, they're in there all the way.
Continuity mistake: In the scene where Justine's husband needs 'help' at the doctor's office, Justine is wearing a flannel shirt and overalls. Then, when she's back at work, she's suddenly wearing a multicolored sweater briefly for one scene (which is what she wears two days later during the day she talks to Holden's parents), then at the end of the day she's suddenly wearing the same flannel shirt and overalls. (00:57:45)
Revealing mistake: When the two main characters explode and then implode near the end, you can see that some of the debris being sucked in are passing "through" various other objects, revealing they are computer generated.
Continuity mistake: When Lee is burning her leg with the hot kettle in her bedroom, the way in which the pink towel is wrapped around her head completely changes between shots. (00:08:10)
Continuity mistake: On the way to the big robbery, Tarzan shoots a hole in the roof of the car with a shotgun. In the next shot we see the car from above and the roof is intact.
Visible crew/equipment: In the bathroom stall scene when Elvis is examining the hieroglyphics, a mic can be seen in the window reflection when the camera shot is looking out of the stall at Jack the old man.
Continuity mistake: In the scene where Alan is showing him how the Thunderpants work, he puts them into a machine to get rid of the stink or whatever it is. It makes a load of noise and just before he takes it out again you see the lights change and he is drumming his fingers just behind them. The very next shot shows him with his hands by his sides.