In the beginning of the movie we're greeted with video footage of someone running for their lives through the house in the woods, which we see is on Youtube and the protagonists are watching it. Later on, it's heavily implied that Lane and his girlfriend faked the footage along with everything else to scare the group, but later we see the exact same footage again, this time though we know it's Lisa who is fleeing from the Blair Witch. So what does that mean? That it wasn't fake? That the witch caused a time loop and left the footage out there just to target those particular people?
It wasn't fake. The implication is that the Witch targets people who had disturbed her, or are related to those who had disturbed her - such as the guy who was part of the rescue party, the woman who wanted to spread the story, etc etc. Her ability to keep people walking in the same part of the forest in the same, completely sunless, "moment" in time lends credence to her sending footage of someone's own death to them.
Where the hell are those noises coming from?
What makes the loud banging sounds the group hears in the forest? In the original the sounds were quieter and subtler, like twigs snapping. Here we have what sounds almost like a giant monster rampaging around the woods. Could it be the woods re-arranging themselves, or time collapsing in on itself? Or is it really supposed to be the sound of the witch trampling through the forest?
It could be whatever the viewer imagines it to be. Part of what makes the franchise so effective is that you don't know what the Blair Witch looks like, let alone the full extent of her powers. The monster that was chasing James and Lisa around the cabin was not the Blair witch, according to an interview with Simon Barrett
The light?
What is the bright flash of white light seen towards the end of the film? Is it the sun rising for only a second as the witch manipulates time? If so, why let it rise at all, and why hadn't it up to that point despite days or even years passing for some characters?
It could be that the witch can control the flow of time within her sphere of influence in the woods, but not stop it completely, so she has to let it rise at least briefly before pushing it back down again. Another explanation is that the cabin is less stable so the time fluctuations are more drastic, with the sun rising and fall randomly.
Voice imitation
Why is it that Lisa's camera records the sound of the witch imitating James' voice, but not the witch imitating Heather? Even if we assume it was really James talking to her, why wouldn't the Heather voice be recorded like Josh's voice was in the original film after his tongue had been torn out?
Neither film shows us exactly how the witch's "voice imitation" power works, let alone what "ingredients" she needs in order to use it. Given that Lisa asked James who he was talking to when he was talking to who he thought was Heather, the witch could have been using something similar to telepathy. As for Lisa catching James' voice on camera, the witch could have been using a power to "record" James' voice and then used it to trick Lisa.
Differences betwixt the Sequel and the Original
In the original The Blair Witch Project, it's established that the standing in the corner bit is because Rustin Parr didn't like the kids watching him kill them one by one. Here, it becomes some sort of weird protection from the witch in a weird departure from the first film.
There's also no real explanation as to how they come to know this, nor is it foreshadowed, mentioned or developed throughout the movie. It just crops up when needed with a character shouting it out. How did they know?
It should be noted the tie-in materials (the original one-shot comic supposedly written by a man who went mad in the woods, the Dossier, the Burkittsville Seven documentary, the Blair Witch Files YA series, etc.) all layer on alternate explanations for what exactly happened in Rustin Parr's cabin. The mythos seems intent on not pinning down exact explanations for much.
The mythology of the original film was "established" by local people telling their local legends to some out-of-town college kids, so we the audience are receiving this information at least third-hand (there's even a scene in the first film of the two fishermen arguing over how the story really goes, and if any of it's even true). Inconsistencies and contradictions are expected in word-of-mouth spread tales and legends, so really only what we see through the cameras is accurate (unless the Witch can manipulate that footage, as well).
In the video game of The Blair Witch Project, why oh why for someone(looking at the main character) letting a highly traumatized war-veteran join in search for a missing kid in a Forest with Abnormal-to-Dangerous activity that starts to f*ck with you by nightfall. This is a clear violation for bringing PTSD personnel alone instead of bringing a group of 7 to keep an eye of for them or better; KEEP them away from high-risk jobs, like finding a missing kid in some woods that CLEARLY hates humans with a broken man as a catalyst.(Chalk this protagonist up as not being the brightest for ignoring his own health issues)
