Other mistake: When the priest is singing to himself in the garden, you can hear a person off camera say "go" just before the mayor enters.
Other mistake: When Ben Stiller and Robert De Niro went to the store there are head rests on the back seats, but on the way back from Owen Wilson's house they've gone.
Other mistake: After Professor Alcott gives back the papers, he dismisses them. A girl then comes up, and you hear him saying something to the extent of "That's the grade we use for failure. See me after class." Didn't he just end the class?
Other mistake: When Nick thinks he is going to be promoted he talks to his PAs about moving to the 44th floor. In the shot of the office building (after he leaves the coffee shop on the way to work) it's obvious that the building only has about 10 floors.
Other mistake: In the second scene in the Gorilla Building, Elizabeth says, "Thank you, Jeff" while talking to Charlie. Thirty seconds later she says, "Thank you, Charlie."
Other mistake: The girls paint their van with brushes before heading off. When the van is being driven later in the film as they make their getaway, it's obviously been airbrushed, as it's too smooth a paint job.
Other mistake: When the children first hit the principal with a snowball, the steak he is cooking lands onto a lawnchair. A few seconds later, his dog picks it off from the ground, and not from the chair.
Other mistake: In the fight scene outside Trish's apartment, Jet Li kicks Maurice so he gets a scar on the right side on his lip. Later in the American football sequence you can at one shot see that he has the scar on his left side of the lip and in another shot it's completely gone.
Other mistake: In the scene where hundreds of men burst into the place where Penelope Cruz gives her cooking lessons, you can see that one of the waitresses drops the plate she is holding a split-second before the guys swing the doors open and rush past her.
Other mistake: If you watch when Haley Joel Osment is being "stabbed" by the bullies, it is extremely obvious that the whole thing is fake. You can clearly see the knife go in under his arm. It is more visible when played in slow motion.
Other mistake: When Brian and Jake are sitting against the fence just after being beaten at basketball, Jake asks why Anna called Brian and not him. Brian yells "What are you, in the eighth grade still? Fynn before Shram." When he says "Fynn" which is his surname, he points at Jake, and when he says "Shram," Jake's surname, he points at himself.
Other mistake: The second time Virginia goes down the slide in the 9th Kingdom, you can see that it is a stunt double hurrying to get off at the end.
Other mistake: When Elliot the genius homosexual and Allison arrive at his apartment he hangs her wrap on the arm of the statue. He then begins to take off his overcoat and hangs it on the other arm. There is a cut to another angle and the coat is already hung on the arm and he is sliding out of it. There was not enough time for this transition to happen. (01:02:15)
Other mistake: Jack's friend Bill (Tom McGowan) was scheduled to have heart bypass surgery, but he is bowling the next day or shortly thereafter.
Other mistake: The timing was way off from the couple visiting from midnight Mississippi, to the actual kidnapping, and she said they had visited last week.
Other mistake: When Nicky is expressing his trepidation about going up to the Earth realm, he states that he's never even slept over at a friend's house. Later when he is on Earth, Beefy has to remind him to try sleeping, as Nicky had no idea what it was.