Continuity mistake: Dr. Klein and Dr. Taney arrive at the house and go up to Regan's room to see her for themselves. We see inside the room and the two doctors, Chris and Sharon are the only ones there but as they try to give her an injection, Karl appears from out of nowhere restraining her. (00:54:05)????
Continuity mistake: After Chris is startled by the exploding flame in the attic there's a shot of a priest caring flowers into the courtyard of a church and if you look closely the flowers on the right are the same in the close-up but the flowers on the left are not. When he walks into the chapel the flowers are rearranged again. (00:31:20)????