Trivia: The entire color palette of the film is limited to seven colors. Every instance of any color is the exact same shade. This was done to evoke the feel of the comic strip origin.
Trivia: The post-production process of the film was very dramatic. The studios became worried that the subject matter was too strange for audiences, and in an attempt to make the film faster and simpler to understand, they demanded that nearly an hour of material be removed from the film. Director Clive Barker also maintains that the film wasn't marketed properly. A Director's Cut of the film (containing much of the cut footage) was announced more than 20 years after the film's original release-date.
Trivia: Even though the characters themselves are constantly confused as to which of them is Rosencrantz and which is Guildenstern, there is a way for the audience to make sure: In the scenes where they take part in "Hamlet" and interact with others, Gary Oldman always delivers the lines of Rosencrantz, and Tim Roth always delivers Guildenstern's.
Trivia: Glenn Close plays Mel Gibson's mother in the movie, even though in real life she's only 9 years older than him.
Trivia: Miriam Margolyes plays Kevin Kline's mother in the film, even though in real life she's only six years older than Kline.
Trivia: Before Damon Wayans was cast as Eddie, Richard Pryor was offered the voice role, but had to decline due to ill health.
Trivia: Richard Gere and Andy Garcia did not get along during the filming, and much of their fighting in the elevator sequence is real.
Trivia: The scene where Quigley triggers a booby trap by swinging his rifle from horseback, at full gallop, whilst holding it by the tip of the barrel with one hand, was only possible because an alternate aluminum barrel was created for that scene.
Trivia: Director William Peter Blatty wanted to title the film "Legion" after his novel the script was based on, while the studio (understandably) wanted to call it "The Exorcist III" for brand-recognition reasons. Blatty absolutely hated "Exorcist II: The Heretic" and felt that the title "The Exorcist III" would suggest this movie followed that one, so he countered by suggesting they title the film "The Exorcist 1990." The studio eventually won out and went with "The Exorcist III."
Trivia: Pamela Poitier, who plays the role of Nurse Satler, is the daughter of the film's director, Sidney Poitier.
Trivia: As an in-joke, Brian Hope and Charlie McManus are both credited as playing the flight attendants in the ending credits.
Trivia: When the agent pulls from the computer record Richard's file, an alias listed is "David Putnam - Columbia Pictures", employed from 06/04/1973 to 02/01/1975. That's an obvious reference to producer David Puttnam (two Ts), who had a brief stint as head of Columbia Pictures in 1986-87, not making many friends in the then Coca-Cola owned production company. (00:12:50)
Trivia: Shirley MacLaine (born 1934) is only fifteen years older than Meryl Streep (born 1949), who plays her daughter.
