Continuity mistake: When Bonnie is running toward her parents while shouting, "Mom, Dad, look what I made," Bonnie's holding her backpack's top handle with the front of the backpack facing her. Then it cuts to Bonnie running into her mother's arms, and now the backpack is positioned the opposite way with both shoulder straps facing Bonnie, as she is still gripping that backpack's top handle in her hand, palm clenched in the same direction. (00:14:05)
Revealing mistake: The film was rushed to theaters, leaving a few mistakes which Universal fixed. In the original cut, toward the end, Judi Dench's human hand is visible, complete with her wedding ring. This was fixed for the re-release.
Continuity mistake: When Ash and friends are entering the wharf, there are two people that change between shot. There is also a person who goes from having his right hand in his lap to having it scratching his head. (00:23:06)
Visible crew/equipment: As the log rolls down the hill with Dora and her friends, for a brief second in one of the shots, you can see either a stunt crew or other production person on the far right of the screen. (00:43:00)
Other mistake: When the characters go to the Himalayas, the whole time, like for 20 mins, including the confrontation scene, they are all wearing casual, short-sleeved shirts. You can see Mr. Burnish's henchmen wearing winter clothing, while the main characters don't freeze to death. They only start getting cold after a long time.
Continuity mistake: When Dumbo is born, Medici is taking a bath. The amount of foam on his arm changes between the front and back shots.
Deliberate mistake: At the speed trap, Tom points his radar gun at a turtle. From his perspective, he seems to be looking through some sort of scope with cross hairs and numbers on it at the turtle to line up the beam. However, when he then looks at the radar gun at the speed indicated as 1 MP/H, there is nothing on the gun where he could have been looking through such a scope. At best, the top of the run appears to have plastic iron sites. The scoped view would not have been from the device itself perspective since it would not need cross hairs or numbers on said cross hairs as that would be for a person looking through it to have reference points. This scope view of the turtle was most likely just added by the film makers to have a better visual representation of Tom aiming the radar gun at the turtle. (00:04:29)
Visible crew/equipment: Aladdin is running away from the guards with Jasmine: he counts to 3 and jumps from a roof. In the overhead shot there's an extra mat on the landing point to cushion his tumble and roll, which disappears in the following shot. Very visible, being white and along the parapet. (00:10:30)