When Matt calls 911 multiple times but keeps getting cut off because of a weak signal, 911 would in fact have attempted to call him back even before he tried calling them again, so long as he has active service with a provider. *Maybe the 911 call center wasn't able to get through to him, since the signal was so weak.*
Guy running away from Sasquatch/Bigfoot would not be able to film the pursuer behind him without losing space on his pursuer.
In the 67th minute when the trailer goes over the embankment, the camera recording the event shakes and shows some distortion in the picture, but does not actually move, i.e., land on the ceiling, etc.