Originally, there were lines from Karras and Merrin about why the demon would terrorize Regan. Merrin says that the point is to make them despair: Regan herself wasn't the target, the demon simply made her do horrible and unspeakable things just to instill fear into other people, and shake their faith in God. While screenwriter William Peter Blatty felt that this exposition was necessary, director William Friedkin thought it was superfluous, feeling that this was already obvious and self-evident to anyone who watched the movie, so he edited it from the original cut (much to Blatty's chagrin). Later when Friedkin re-cut the movie for the 2000 re-release, he put it back as a favor to Blatty, since Blatty wrote the book and gave him one of the biggest hits of his career.

Film

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