Continuity mistake: When Chris is taking a walk with the priest Damien, she throws her cigarette to the ground, but in the next shot it's back in her hand again.

The Exorcist (1973)
Plot summary
Directed by: William Friedkin
Starring: Max von Sydow, Ellen Burstyn, Lee J. Cobb, Linda Blair, Jason Miller
When Chris McNeil begins to notice strange things going on with her daughter, Regan, she takes her to the hospital. However, the doctors can't find anything wrong with Regan. Finally, believing that Regan is possessed by a demon, Mrs. MacNeil asks a priest who used to be a psychiatrist, Damien Karras, to exorcise the demon.
Demon: What an excellent day for an exorcism.
Father Damien Karras: You would like that?
Demon: Intensely.
Father Damien Karras: But wouldn't that drive you out of Regan?
Demon: It would bring us together.
Father Damien Karras: You and Regan?
Demon: You and us.
Question: What is Chris McNeal's assistant listening to on the radio when Father Merrit arrives?
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Answer: When it cuts to Chris MacNeil's PA, Sharon, listening to the radio it's only for about 20 seconds, and all we hear is a voice which presumably belongs to a random radio host or guest who is in the midst of offering motivational advice. This short scene serves to show Sharon's tension with what's going on in the house.
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