Other mistake: When Edgar goes to retrieve his hat and umbrella, he uses a fishing pole to snag the hat from Napoleon's head. You see him reeling in the line when it should be reeling out (counter-clockwise vs. clockwise)-the next shot shows the line going down. This happens twice.
Other mistake: When the three kittens are playing train on the train bridge, Berlioz is standing in front, then Toulouse, then Marie. After Berlioz says, "Marie's the caboose," look at Marie's reaction, and Berlioz is painted in front of her instead of Toulouse.