Best animated movie revealing mistakes of 2004
Revealing mistake: Although the movie is filmed with puppets on strings, their movements and their surroundings are made to look as realistic as possible. This nitpick shows a moment when that doesn't happen. As the terrorists begin shooting up Paris, one terrorist runs down the street (in front of the bakery) as citizens run in every direction. One puppet (a female wearing a dress with yellow and white stripes) runs off camera to the left. After she runs out of the shot, the shadow of the puppet appears on the building corner (left side of the screen), being lifted up and out of the scene.
Revealing mistake: You can see Hero Boy putting the ticket in his pocket after getting it punched the second time, before finding his seat on the return journey. However, the ticket slowly evaporates in the air as he is about to put it into the pocket. His hand thus enters the pocket ticket-less.