Factual error: When Napoleon is up in the air in the basket held up with balloons, you can see the Sydney Harbour Bridge, however on his adventures, he goes past Eagle Rock, which is not near the city. Also he meets a Frilled-Neck lizard, which is found in a different state to Sydney.
Revealing mistake: Near the end of the film Willy jumps on a barrier in the water, causing it to break. During that scene its clear that the orca has been pasted into the background as the outline is too sharp.
Continuity mistake: When Max is running out of the school after successfully becoming cool. We see his friend with the orange mohawk at least twice. Once hanging from a statue, and another where he's reaching out from a school bus. These two shots are really close together so there is no way that he could have moved that quick.
Continuity mistake: After the fruit people fall down, the camera pans over to a Christmas tree with lots of large red ornaments on it. You see The Nutcracker’s reflection come up on one as they move closer, and the reflection shows he has his arm outstretched pointing at something. The camera then cuts back to show Nutcracker and Marie, but his arm is not extended. He then lifts his arm to point.
Continuity mistake: In the lunchroom when the boy gets tripped, a bunch of the food flies out of the bowl in the slow motion shot. When the bowl lands on Steve Guttenberg's head, it's full of food.
Continuity mistake: When Angus and Yellow reach the lake, Angus's face is tore up pretty bad, but after they cross the lake and go to the building on top of the mountain his face is almost completely free of any injuries.
Factual error: Calamity Jane was not Pecos Bills love interest. According to legend Pecos Bill was married to Slue Foot Sue another tall tale. Whereas Calamity Jane was an actual historic figure.