He Also Did: Not only did Nicholson write the screenplay (during the brief pre-Easy Rider period when he was trying to transition away from acting to writing and directing), he also assembled the soundtrack album.
What Could Have Been: The part of Lord High 'n' Low was written for Bruce Dern. In fact, the character was originally called Dernsie. But having a classic Large Ham like Timothy Carey in the role probably fit the film's oddball tone better.
Working Title: It was originally going to be called Changes, but right after filming began they found out there was another movie with that title already in production. After that it was variously called Untitled, Movee Untitled, and DASturb. Changes eventually became the title of the last Monkees album before their 1970 breakup (after being reduced to a Davy-Micky duo).