Continuity mistake: In the scene where Mindy is showing Spongebob and Patrick "Planktopolis," it shows a large fully-built statue of Plankton. A few seconds later the right side of the head is shown missing and still being worked on.
Continuity mistake: During Gary's speech at the end, in one scene his hair is messy, but as the camera angle changes it is straightened again.
Continuity mistake: When Howl first flies with Young Sophie, he wears a ring on each hand. As they take off, one of the rings momentarily vanishes.
Plot hole: In the scene where the Sheriff stops the cows' brawl, he gives them to the Chinese man. The Sheriff knows what Pearl's animals look like, so why didn't he recognize the cows as Pearl's?