Tim Burton originally considered several other actors for the role of Betelgeuse including Sammy Davis Jr., Sam Kinison, and Dudley Moore. We can't imagine anyone but Michael Keaton as the Ghost with the Most, though. (Source)

"Day-O (The Banana Boat Song)" almost didn't appear in Beetlejuice. Though the cast and crew spent five days filming the highly-choreographed scene, the movie studio thought it was weird and asked that it be dropped from the film. Tim Burton almost agreed, until he and composer Danny Elfman decided to put the dance number back in at that last minute. It would go on to be one of the most memorable sequences from the entire film. (Source)

After the success of Beetlejuice, Tim Burton thought about doing a sequel. The working title was Beetlejuice Goes Hawaiian. It would be part surf movie, part German Expressionism and involve the Deetzes developing a hotel complex on an ancient burial ground. Note to Hollywood: sometimes it's okay to leave well enough alone. (Source)

Alec Baldwin and Geena Davis would both go on to portray American presidents on TV. Davis starred as President Mackenzie Allen on the 2005 TV show Commander in Chief, while Alec Baldwin would satirize the 45th president of the United States—Donald Trump—on Saturday Night Live. (Source)

Ready for a little spelling trivia? Throughout the movie, the title character's name is spelled Betelgeuse. But on in the opening credits it's written as Beetle Juice. On the front of the DVD case (and on IMDb), the title appears as Beetlejuice. So what exactly is this guy's name? It's clear that Tim Burton wanted to go with Betelgeuse, but the movie studio was worried that people wouldn't be able to pronounce the word. They went with the simpler spelling instead. (Source)