About a third of the way into the movie when Josh already disappears, there are two quick scenes where Heather is resting in Mike's arms. The whole movie is supposed to be their footage, and yet if you pay attention you'll see that the scene abruptly cuts to Mike and Heather sleeping. If this was really their footage then we should of seen Heather get up, turn off the camera, turn it back on, and go back to sleep.