In an effort to get Gromit out of the house, the penguin plays very loud music. One tune is "How Much is That Doggie in the Window?" and another is "Tie a Yellow Ribbon Round the 'Ole Oaktree" which indicates that he's just been released from prison.
The rubber glove that Feathers uses to cover his head has only 4 fingers (as is common in animation) despite the fact that Wallace and all humans in other Wallace and Gromit films have 5 fingers on each hand.
The filmmakers of Toy Story (1995) have indicated in interviews that the moving-van chase scene at the end of the film was partially inspired by the toy train chase scene from this film. The Pixar animators considered the toy train sequence to have set a standard for action which they had to surpass in this full-length computer animated film.