Audio problem: When Gromit is knocking on his bedroom door to get Feathers McGraw to turn the loud music off, his bangs are out of sync with the sound produced.
Continuity mistake: One of the tiles comes loose when Wallace is walking across the ceiling in the museum. A few seconds later, the tile is flat against the wall again.
More trivia for Wallace & Gromit: The Wrong Trousers
Question: How was the rain scene accomplished?
Answer: It was added at the edit. During the animation, the animators just made little sprinkles on the characters so it would look like the rain actually hit them.