The series was called "The Mighty Boosh" because of a haircut Michael Fielding once had that his Spanish friend called "the mighty bush." Noel Fielding and their friends found it amusing and used it as the title.
Steve Coogan wanted to portray the character Kodiak Jack from the episode "Call of the Yeti" in Season 2 but Noel Fielding & Paul King wouldn't let him because it was Rich Fulcher's only character for the episode.
There are 100+ different seemingly original similies and figures of speech in the first series alone including "[...] like an extreme bazuka" and "Who are you, Johnny Segment?"
The show often uses family and friends of the actors as extras. Michael Fielding (who plays Naboo) is the brother of Noel Fielding (who plays Vince), and Fielding's mother and nephew also play two shamans in the show.
The Cartoon Network series The Regular Show is heavily inspired by The Mighty Boosh.