Trivia: The cyclops thumb in the bar, who says, 'Woo-hoo' is in every thumb movie.
Trivia: In the original book, the boy who's friends with the snowman isn't given a name. In the film he's given a gift by Father Christmas with a nametag on it, so the filmmakers opted for James, the husband of one of the animators.
Trivia: Gromit was originally supposed to be a cat, but it was decided that a dog was easier to sculpt from plasticine.
Trivia: When a group of people are watching a TV towards the end of the cartoon, there is a banner above the set saying "Foster's Television" - a reference to the Warner Brothers story writer Warren Foster.
Trivia: After Sylvester has swallowed the bowling ball, he goes back down the drainpipe and out into the street. When this happens, look behind him and you can see a sign saying "Drink Friz! Six Delicious Flavors" - a reference to the director Friz Freleng. There is also a building with "Champin's 5 and 10" on it - a reference to the animator Ken Champin.
Trivia: When Porky is walking past the movie theatre, all of the film posters have moustaches drawn on them. You can see a poster of Warner Brothers star Bugs Bunny with a moustache at the ticket office.
Trivia: Just after Linus seals his letter to the Great Pumpkin in an envelope, he walks past Lucy who is sitting on the floor watching TV. In her hands, Lucy is holding an issue of TV Guide Magazine. On the cover? Lucy, sitting on the floor in the same position, wearing the same blue dress. (00:07:00)