Revealing mistake: In most of the shots with fast forwarding you can see that there is no synchronization between breathing movement of the stomach and the time passing by (most obvious on night #15 when Katie is standing looking at Micah who's still asleep). (00:37:50)
Revealing mistake: On night 21 the time-stamp changes from 11:59:56 PM to 11:59:57 AM despite it not having turned midnight yet.
Answer: The screenwriter confirms in the commentary that burning the cross and picture was a mistake because it was the last defence they had.