Did you know that movie was originally a straight-up horror film rather than the horror-comedy? And the scene of Beetlejuice appearing as a giant snake had a different-looking puppet before Michael Keaton was signed on to play the title character, so they had to make a new puppet and re-shoot the entire sequence. And lastly, Beetlejuice's epilogue wasn't in the movie originally, but it was added when test audiences were sad that he "died" so now they know he's fine (just a little... light-headed, if you know what I mean).