Alright, so I haven't seen the film and it's been a while since it was released, but it's been bugging me for a long time. The entry on The Other Wiki says that the serial child killer killed his victims in pairs. Then why is the total number of children he killed an odd number (seven)?
From castleofspirits: "In all Parr took eight children, but only killed seven of them. He claimed that the woman in the black cloak appeared to him after he'd killed the seventh child and told him that he was finished and that he was to go into town the very next day and tell everyone what he had done. She said she would leave him alone if he did this. Parr released the last child, Kyle Brodie and cried doing so."
Ah, that clears up my confusion. Thank you.
How was the footage found in the forest that was meant to keep you from leaving?
the forest itself didn't keep people leaving—the main characters were very poorly equipped to go on any sort of hike, and as such didn't even need any supernatural influence to get themselves killed. Chances are that the supernatural influence liked to pick off small groups instead of large ones.
So somehow, the group that discovered the footage just wandered into a building, downstairs, then brought it back to civilization?
Presumably whatever force killed them is supposed to be sentient, and likely made the decision to let someone find the video and bring it back to the world at large. It apparently wants people to know what it's doing, given that it requires Parr to leave one of his victims alive and reveal what he did and why he did it before it leaves him alone.
The forest doesn't trap everyone that enters. In many of the previous killing incidents there have been search parties looking for missing/murdered people who got home fine (with one notable exception being the Coffin Rock murders). Not to mention that the killings are spaced at least a few decades apart. The forest has its own rules on how it operates and obviously not by any human logic.