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 crowd are booing the hecklers, in a wide shot, most of the people are drawn without faces. This is even more noticeable when the crowd turn to Mima after she shouts at them. There is also very little detail is put into the animation of their hands, they come off as stumps attached to their arms, with no fingers. (00:06:26)