Visible crew/equipment: When Mika brings Katie upstairs after investigating another noise downstairs, you hear a thump come from downstairs. Mika turns the camera down the stairs, and you can see a crew member scrambling to get out of the shot.

Paranormal Activity (2007)
1 visible crew/equipment mistake
Directed by: Oren Peli
Starring: Katie Featherston, Micah Sloat, Amber Armstrong, Mark Fredrichs
Genres: Horror
Visible crew/equipment: When Mika brings Katie upstairs after investigating another noise downstairs, you hear a thump come from downstairs. Mika turns the camera down the stairs, and you can see a crew member scrambling to get out of the shot.
Trivia: As part of a marketing gimmick, the film wasn't going to receive a traditional release. Instead, audiences could click a button online to "demand" their local theaters get a copy, and once an area got enough "demands," a copy would be shipped there. This was done because the studio was worried they wouldn't make enough money if they did a wide release. So many people ended up "demanding" the film, that the studio eventually caved and gave it a wide release. It became a massive hit.
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?
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Answer: The screenwriter confirms in the commentary that burning the cross and picture was a mistake because it was the last defence they had.