Revealing mistake: When Stan falls into the dug-out at the baseball game you can clearly see the crash mat that he lands on.
Revealing mistake: When Robert Stack introduces himself in the hotel room he says he is an A.T.F. agent, but the ID he shows says F.B.I. (00:26:45)
Revealing mistake: At the end, when the NYC children are rushing toward the peach to scoop out a piece to eat, you can see one little girl running with a piece of peach already in her hand.
Revealing mistake: At the start of the montage in which Frollo ransacks Paris for the gypsy girl, the shot of the three soldiers kicking down the baker's door very briefly places the more distant soldier off to the right "in front" of the closer central soldier; this is a case of incorrect animation cel layering.