- Acclaimed Flop/Cult Classic: It was badly received upon release, partially because nobody expected The Monkees to star in such a Mind Screw of a film, but is now a respected work. Not only have people have come to appreciate its weirdness, but the subsequent fame of Bob Rafelson and Jack Nicholson certainly helped. And of course, the Monkees have been Vindicated by History.
- Fake Nationality: The Swami is presumably supposed to be from India, but he's played the Burmese-Jewish Abraham Sofaer.
- 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.
- That chiming electric guitar part on "As We Go Along"? Played by Neil Young.
- Keep Circulating the Tapes/Vindicated by Cable: After its brief run in theaters Head was almost impossible to see. For a long time a couple late night airings on CBS in The Seventies were the only exposure it got in the US. Around the time of the 1986 Monkees comeback it was released on VHS and had a run in specialty movie theaters. Numerous airings on TBS and TNT in The Nineties finally gave it a wide audience.
- 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.
- Michael Nesmith was slated to write the score at one point.
- 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, with Head being chosen almost at the last minute. Changes eventually became the title of the last Monkees album before their 1970 breakup (after being reduced to a Davy-Micky duo).