Continuity mistake: The Psychiatrist that hypnotizes Regan is wearing a tie that in the close-ups, is retied differently as the scene progresses. (01:02:05)

The Exorcist (1973)
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Directed by: William Friedkin
Starring: Max von Sydow, Ellen Burstyn, Lee J. Cobb, Linda Blair, Jason Miller
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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.
Question: What was the significance of the father being an absentee dad? Did that make Reagan more vulnerable to being possessed?
Answer: It's possible it made her more vulnerable, but the mother, being a big movie star with an adolescent child would probably be divorced at this stage. It was more likely a literary choice by the author. Fewer characters make for a less complicated plot and eliminates the need to add an additional character who may not serve the story in a meaningful way.
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Answer: The demon wants everyone to lose hope for the girl and give up on her. Her father, having already flown the coop, just makes this goal that much easier.
TonyPH