Continuity mistake: When Sally is disturbed by the resemblance of her friend, who was recently killed and then her body was stolen from the morgue, to the wax figure of Joan of Arc, she reaches up to touch the left side of the face, but when Vincent Price turns up, she is touching the right side of her face.
Revealing mistake: In the beginning where Vincent Price is brawling with his business partner, his partner throws a pipe or bar at him. Price ducks and the bar hits something that the camera was connected to, because the scene jerks.