Continuity mistake: When Big Bob throws a model of Arnold's house in the trash it lying on its back but when it shows it again it is standing up straight.
Continuity mistake: When the villagers are joining the old chief on the beach, to see all the beached whales, it is raining heavily, yet his face and suit are completely dry.
Continuity mistake: When the King enters the castle a bowl of chocolate pudding is dropped on his head. You can clearly see the pudding run down his face, however when the bowl is removed from his head the bowl is completely empty and the King is totally clean. (00:19:55)
Continuity mistake: In the scene when Justin's father is coming out of the shed dressed as Santa Claus (the second time), the clock next to Justin reads 12:00. When he hears the "Ho Ho Ho" and gets up out of bed to go to his window, the clock says 11:56. (01:15:40)
Continuity mistake: When Spirit pretends to be dead while pulling locomotive, and they take the chains off him, he has a halter on his head. Yet two seconds later, the halter is gone.
Continuity mistake: When Kermit is in the park looking at his plaque he wipes off all the snow and reads it. In the next shot of him walking to a nearby bench the plaque is covered again but it is not snowing heavily enough to have been covered so fast.
Continuity mistake: Pa Grape has gold rings on his moustache. When Jonah and the three pirates have just entered Nineveh and are talking amongst themselves, from shot to shot his rings change from gold to black and back again.
Continuity mistake: Jane has the key in her hand, trying to unlock Peter Pan from the chains. But when Jane starts to fly, her hands spread out and the key disappears. Then she goes to free Peter Pan, and the key is back on her hand.
Continuity mistake: When David makes his first flight he is wearing his uniform as he dives into the canyon. As he comes out he is wearing the clothes he has on at the end of the film when he drops the sunstone. He switches back to his uniform when his first flight ends.
Continuity mistake: During the chase in chariots (2 Romans against Astérix), when the palace is attacked, in one shot, we can see there is only one Roman soldier on his chariot instead two. (01:21:55)