Question: When Spaceball 1 achieves ludicrous speed and overshoots the Winnebago, Barf is heard to remark "they've gone to plaid". Is this just a joke about eighties style special effects or is it a reference to a specific film?
Answer: Its a reference to how the stars streak around the ships in "Star Wars". "Ludicrous speed" had to have a ludicrous color. It is also referencing 2001: A Space Odyssey, where this "tartan" effect occurs when Dave is in the pod towards the end of the film.