Many of the witches in the coven suddenly change outfits in between shots and then back again.
The directions given to the movie studio not only make no sense, but they are different every time they are given - yet none of the characters have any trouble finding the studio.
When Detective Robert says "she must have went inside", his lips are clearly not moving.
When the police profiler shows up at the movie studio, a grip can be clearly seen at the side of the frame, holding a light up to her face.
Light stand visible in the reflection in the mirror in Stacy's bedroom.
Shadow of cameraman visible in the first shot of the new coven initiates walking through the alley.
Stacy somehow manages to leave a message on Rich's machine and somehow knows where she is, even though she was magically teleported there, did not have access to a phone, and never would have had a chance to make a phone call.
Boom mic visible in the scene where the first client sits down to speak with Malucina.