Deliberate mistake: Fritz rescues the mud-trapped zebra and Roberta rides it across the island to the tree house, then again later in the race. Zebras, however, cannot be domesticated or ridden. To film these scenes, Disney & Co. painted a white horse with zebra stripes. (01:20:00 - 01:46:30)
Deliberate mistake: The barber is on the roof scarping from the stormtroopers and he falls down face through a window. When the shot changes to the inside of the house where the window is, he is falling on his back.