Revealing mistake: Annie hears the sound of scribbling in the distance and follows the sound into Charlie's room. When she enters at 1:26:13, you see Charlie's doodle book on the bed being written in and the pages flipping on their own. If you look to the left of the bed, there are a few visible wires running from the book towards the wall to turn the pages. In the photos, they can be seen towards the bottom of the nightstand. In motion, it's pretty easy to see the wires bouncing around (from 1:26:13 to 1:26:21). (01:26:13)

Hereditary (2018)
1 revealing mistake - chronological order
Directed by: Ari Aster
Starring: Toni Collette, Gabriel Byrne, Alex Wolff, Milly Shapiro
Factual error: Spoiler: In the scene toward the end of the movie when the dad is burned alive, his skin is completely black but his clothes are still on and intact, just blackened. With fire hot enough to completely blacken the skin, it would have burnt the clothes completely off (or at most they would have been shredded rags). (01:51:25)
Question: After Peter is possessed by Charlie and he clicks his tongue for the first time after standing up, he starts to walk towards the tree house and heads off screen. The camera lingers though, and focuses in on something lying on the ground in the background. What is that on the ground? It almost looks like a dead dog or possibly the dead dear from earlier, but the shape isn't quite right. It does appear to be some sort of animal but I can't make it out. What is that the camera lingered on right then? And why? It's not shown again. (01:57:45)
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Answer: Earlier in the film, Peter swerves the car to avoid hitting a dead animal in the road, resulting in Charlie's decapitation. That animal appears to be a goat (a ram) with slightly curled horns. Within the context of this movie, this is probably a Sabbatic Goat, alluding to Occult symbolism associated with the Mystic Pentagram and the Satanic deity Baphomet. The implication is that Satanic forces caused Peter to swerve off the road, killing Charlie in preparation for migrating her soul into Peter. The dead animal seen in the background at the end appears to be the Sabbatic Goat again, marking completion of Charlie's soul migration into Peter.
Charles Austin Miller