Revealing mistake: After Littlefoot and Cera's fight, Cera's dad says that each herd is on its own. This shocks the little dinosaurs and they gasp. Notice in this shot that though the dinosaurs move, their shadows don't. Petrie doesn't even have a shadow.
Revealing mistake: When the screenwriter hears the music playing, there is a wide shot of the parking lot he is in. In the shot, many of the number plates on the cars do not have any numbers or letters drawn onto them. There is a white car beside the elevator that has a very faint M and the start of another letter beside it, but is incomplete. And the number plates on the cars facing opposite the screenwriter do not have any numbers or letters at all. (00:41:47)