Defictionalization: The Taco Bell logo seen in this movie was later used as a tie-in by the restaurant and eventually became the basis for their current logo. It turns out the heads of Taco Bell at the time were big fans of the movie and did so as a shout-out.
Doing It for the Art: Nigel Hawthorne, inexperienced in cinema, took his role to prove that he had screen presence for the producers of The Madness Of King George. Hawthorne wanted to reprise the stage role for the movie version. As it transpired this was unnecessary as Hawthorne was the producers' automatic choice for the lead.
Science Marches On: Among the things listed as "not good for you, hence illegal" are spicy foods. Since the movie came out, though, spicy foods have been shown to help burn calories and reduce blood pressure. Also, dark chocolate has been shown to have antioxidants which can reduce free radicals in the body, lowering risk of cancer.
When Stallone got on board, he tried to convince Jackie Chan to take the part of Phoenix, which would have made Huxley's Saw It in a Movie Once moment a whole lot funnier. He turned down the role, as he didn't want to confuse audiences by suddenly appearing as a villain.
Edgar Friendly was originally known as "Thomas Payne" in the original script, which would have made a hell of a shout-out considering the character.