Audio problem: As Annie is trying to leave Joan's house and she starts to give Annie instructions on how to do the ritual, it's obvious the audio for Joan's lines was dubbed in in post as a lot of her speech doesn't quite match up with her lips. Especially when she's saying "Your whole family needs to be in the house". (01:08:00)
Hereditary (2018)
1 audio problem - chronological order
Directed by: Ari Aster
Starring: Toni Collette, Gabriel Byrne, Alex Wolff, Milly Shapiro
Continuity mistake: Peter dives through the window of the attic, shattering it with shards of glass and window frame busting out and falling with him. When the camera pans down to him lying on the ground, there isn't a single shard of glass or piece of frame seen anywhere. (01:56:10)
Annie: It's heartening to see so many strange, new faces here today. I know my mom would be very touched, and probably a little suspicious. (00:04:00)
More trivia for Hereditary
Question: Not sure this is a movie mistake. When the mom is sawing off her own head, wouldn't the sawing have stopped once she cut through her spinal cord? The muscles in her arms/hands would have gone limp and her head would not completely fall off - though it would fall forward. You don't actually see her head fall but you hear the bang on the floor and her head is missing at the end.
Answer: When she's sawing off her own head, she's also suspended about 12 feet in the air. Afterwards, you also see the headless mom's body levitating up to the treehouse. So, obviously, there were powerful demonic forces that suspended her in the air, sawed off her head, then carried her up into the treehouse.
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Answer: There were supernatural forces at work, so basic rules of human anatomy and physics don't really apply in the situation.
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