Continuity mistake: Father Dyer tells Chris about Father Karras' mother's death and gets the story wrong. He tells her that she died in the apartment and was there for several days before they found her. This contradicts all we saw in the previous scene in the psychiatric ward.
The Exorcist (1973)
141 mistakes - chronological order
Directed by: William Friedkin
Starring: Max von Sydow, Ellen Burstyn, Lee J. Cobb, Linda Blair, Jason Miller
Regan MacNeil: You're going to die up there.
Trivia: The vomit that Linda Blair spewed was actually split-pea soup. Specifically, the effects crew decided to use Anderson's split-pea soup because Campbell's split-pea soup wasn't green enough.
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Answer: It was indeed Pazuzu, he wanted Regan to believe he was some friendly entity to gain her trust. Thus the Captain Howdy facade.