The Exorcist

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• The "spider-walk" sequence, which was cut from the original version, was reworked for Ruby (1977) and other low-budget films.
• Movie Goof (continuity error): When the clock stops, the pendulum stops on the left side of the clock-casing. When the camera cuts back to the clock the pendulum hangs to the right
• Lalo Schifrin's score was rejected (see also The Amityville Horror). William Friedkin later said that had he heard the music of Tangerine Dream (II) (who scored his later film Sorcerer) earlier, he would have had them score this film (from the "Sorcerer" soundtrack liner notes).
• The language lab scene was filmed in a room in the basement of Keating Hall on Fordham University's Bronx campus. The same room was used as a Pentagon office in A Beautiful Mind.