Revealing mistake: Towards the beginning of the film when Ben Stiller looks at the photo at him and his son, you can see that the photo is a fake. Ben and his son cast a shadow on the shadow behind them.
Continuity mistake: The epaulets on Larry's normal jacket disappear and reappear between shots.
Continuity mistake: When Larry tells Rebecca that the museum comes to life, they are in front of the Neanderthal display. But when Rebecca leaves, they are in front of Teddy Roosevelt.
Continuity mistake: In the end, when Larry meets up with Teddy Roosevelt, during that whole scene, the people in the background change positions, especially the guards in the blue cape.
Factual error: The tablet was said to be 24kt gold. Something of that size in gold would be very heavy, but the kid carries it around like it has very little weight to it.
Factual error: When Larry is running away from Attila the Hun into the elevator, he pushes both hall buttons (up & down). When the elevator is descending, the indicator shows him going down from the top floor. The top floor only has a down button. Also, in that type of Otis elevator, when both buttons are pushed, the up light goes out first, indicating the elevator is answering an up call. The doors would recycle to answer the down direction before the down light would go out.
Continuity mistake: When Larry is about to grab the bone for the first time, a brochure on the right appears and disappears between shots.
Other mistake: When Larry crosses the street, when going to the museum for the first time, the traffic light for pedestrians is red the entire time. Yet he and other pedestrians casually cross the street (he even stops for a bit) while the yellow cabs don't make any attempt at driving off (although their light should be green). Although there's a small gap between one light turning red and the other turning green, it takes close to 10 seconds while nobody appears to be in any rush.
Continuity mistake: When Larry is interviewing with the Big Apple employment agency, the business cards in the desk holder move from being all neatly assembled within the holder, to being lifted out on the left bottom corner.
Continuity mistake: When Rebecca leaves the Museum after sitting in front of the Sacajawea display after Larry asks her to leave as he's closing up, from the internal shot of when she's leaving the Museum she exits through the middle rotating door but on the outside shot she is seen leaving from the door on the right hand side of the Museum.
Suggested correction: She is coming out from the same door in both points of view.
Suggested correction: She doesn't exit the middle door. She exits the door on the far left (you can see the 3 red carpets laid out in front of the doors and she's on the 1st/3rd one). The area to her left isn't an exit door.
Other mistake: In the very first scene of the movie where Larry finds his car ticketed and the left front tire booted by the police, there is no padlock on the boot itself.
Revealing mistake: Obvious fake snow when Cecil runs away and the cowboy shows up in the remote controlled car.
Continuity mistake: When the T-rex and Larry are playing for the first time, the position of the bone on the floor keeps changing all the time.
Continuity mistake: When Larry's mouth and clothes are covered in foam from the fire extinguisher, the amount around Larry's mouth and nose changes or disappears and reappears between shots.
Continuity mistake: When Larry walks towards the museum for the first time, the woman behind him disappears in the wide shot.
Factual error: The movie is set in the New York Natural History Museum, and there is a T-Rex skeleton in the movie. However there is no T-Rex skeleton in the Natural History Museum. There is a model T-Rex and a T-Rex skull, but no full skeleton.
Factual error: Columbus is consistently depicted speaking Italian. In reality, he spoke Spanish, Latin and Greek but never Italian.
Continuity mistake: Near the end of the movie, the taxi's windshield is completely clear in the outside shots, but covered in snow in the interior shots.
Continuity mistake: When Nicky turns the stone, there's a close-up shot where a beam of light reflects on his face and he opens his eyes wide. A frame later, from a different angle, the beam is gone and the eyes are shut. Yet when the angle swaps to the previous close-up, the awe expression and light reappear.
Continuity mistake: When Larry and Nick are talking to Teddy, trapped behind bars by the museum workers, Nicky is either above the iron bars or below, depending on the angle.
