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)
121 continuity mistakes - chronological order
Directed by: William Friedkin
Starring: Max von Sydow, Ellen Burstyn, Lee J. Cobb, Linda Blair, Jason Miller
Revealing mistake: When Regan meets Father Karras, she projectile vomits in his face. But if you look closely while this vomit happens, you can very easily notice that it is the stunt double.
Demon: I'm not Regan.
Father Damien Karras: Well, then let's introduce ourselves. I'm Damien Karras.
Demon: And I'm the Devil. Now kindly undo these straps.
Father Damien Karras: If you're the Devil, why not make the straps disappear?
Demon: That's much too vulgar a display of power, Karras.
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