Visible crew/equipment: When Mia first does the ritual, you can see the boom mic on the bottom right corner. It hides in the dark corner, but if you look carefully, you can see it come in the shot. It's easier to, depending on how dark your screen is. (00:20:40)
Continuity mistake: When Lee picks up Sully's hair rope, just as he says "He got Kayla", the hair at the edge of the rope is pointed upwards, but when the shot cuts, the hair is pointed to the left. (02:01:10)