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: After Gromit runs away he starts looking at signs. In one shot, a blue sign goes over the one Gromit is reading (Room to Let), but in the next shot it's not. (00:12:20)
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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.