Trivia: Before the witch trial, you can see Sir Bedevere tying coconuts to a swallow, no doubt to test the theory people argue about elsewhere in the film.
Trivia: The lips in the opening song belong to Patricia Quinn, who plays Magenta. The person singing is Richard O'Brien.
Trivia: In the scene where Doctor Spivey is interviewing McMurphy, this whole scene is improvised. Spivey (Dr. Dean Brooks) is the ACTUAL doctor of the institute in real life, and was simply told to interview Jack Nicholson (McMurphy) as if he was a real patient. Nicholson had to improvise and get from the beginning of the scene to the end.
Trivia: The scene in which the blue car does several flips on the grass would later be used in the first season of the TV show "The Fall Guy" starring Lee Majors.
Trivia: Although Joan Sims plays Patsy Rowlands' mother in this film, Sims was only four years older than Rowlands.
Suggested correction: There was only eight months between the two actresses.
Wikipedia has Patsy Rowland's date of birth wrong. Patsy died in 2005 and in a 2005 article by The Guardian, the article list her age as 71. This would put her birth year 1934, not 1931, which is also confirmed at the end of the article.
Trivia: What was Mr Mason's first name?
Trivia: Ken Russell wanted Christopher Lee to play The Specialist. However, Lee was unavailable, filming The Man With the Golden Gun in Bangkok. Russell eventually cast Jack Nicholson.
Trivia: Stanley Kubrick's daughter has a cameo as the young girl sitting behind Lady Lyndon at the magic show.
Trivia: Although Jon Lormer plays Katharine Hepburn's father in the film, he was only one year older than Hepburn.
Trivia: The Hindenburg explosion and fire towards the end of the movie combines filmed footage with actual newsreel footage of the disaster.
Trivia: Max von Sydow is only 11 years older than Joanna Miles in real life, despite portraying her father.
Trivia: Production of this movie was not easy for John Wayne. The actor was suffering from heart problems and had only just recovered from a severe bout of pneumonia.
Trivia: Science-fiction author Harlan Ellison wrote the original novella "A Boy and His Dog" in 1969, and director L.Q. Jones wanted Ellison to also write the screenplay for this 1975 film. When it became apparent that Ellison could not provide a screenplay (due to "writer's block"), Jones co-wrote the screenplay. In a DVD commentary decades later, Jones said that Ellison was pleased with the finished screenplay and movie except for certain dialogue. Ellison was especially offended by the last line of the movie, spoken by the telepathic dog, Blood: "Well, I'd say she certainly had marvelous judgment, Albert, if not particularly good taste." (This grisly line alluded to Vic and Blood eating Quilla June Holmes, the female love interest, in an act that happens off-camera.) Harlan Ellison said it was a "moronic, hateful, chauvinist last line, which I despise."
Trivia: Lina Wertmuller became the first woman to be nominated for an Academy Award for Best Director with this film.
Trivia: By open admission of one of the original artwork designer Akira "Akiman" Yasuda, the movie (known in Japan as "The Street Fighter") inspired at least 2 of the most iconic backgrounds of the game Street Fighter 2: it is really obvious when you watch the fight between Jim Henry and "the kid", on the docks with a boat in the background much like in Ken 's stage. The cage fight against Henry inspired also Zangief's stage. (00:19:30 - 00:47:50)