Revealing mistake: On night 21 the time-stamp changes from 11:59:56 PM to 11:59:57 AM despite it not having turned midnight yet.
Paranormal Activity (2007)
Ending / spoiler
Directed by: Oren Peli
Starring: Katie Featherston, Micah Sloat, Amber Armstrong, Mark Fredrichs
Genres: Horror
One night in early October, Katie gets out of bed, stares and stands next to Micah and leaves the room. Some time later she screams, Micah wakes up and goes downstairs. Katie kills him (offscreen) and then throws him towards the camera. She sits down next to him and then suddenly rushes towards the camera. Some text on screen mentions that Micah was found by the police days later and Katie's whereabouts are unknown. Alternate endings: 1) Katie kills herself after killing Micah. 2) Katie returns to the bedroom (after killing Micah) with a knife and her clothes are stained with blood. She's in a catatonic state for a few days and her friend Amber calls the house. Some time later, the police go to the house and when they see Katie, they tell her to drop the knife. She doesn't let go of the knife, she's confused (and no longer possessed) and asking "Where's Micah?". A door slams shut and this startles the police officers and they accidentally kill Katie.
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Trivia: At one point before the film was widely released, the studio was interested in remaking the film with a larger budget and more well-known actors, and including the original version of the film as a DVD "special feature." Thankfully, this idea was eventually shot down, and the original version of the film was released in theaters.
Question: Can someone tell me if I'm interpreting this correctly? When Katie changes her mind about fleeing the house and is found clutching a cross with blood on her hand and leg, Micah takes it and burns it, after which she becomes possessed. Was she successfully warding off the demon with the cross and clutching it so desperately that it made her hand bleed, and then Micah wrongly thought it was being used to attack her and inadvertently made her possession a done deal by burning it?
Answer: The screenwriter confirms in the commentary that burning the cross and picture was a mistake because it was the last defence they had.