Continuity mistake: When Joe awakens after his first night at Norma's mansion, his shirt is un-tucked as he puts on his jacket to go outside. When he is running down the stairs in the next shot, his shirt is tucked in. (00:26:35)
Continuity mistake: At the end of the movie as Norma descends the long curved staircase, she is being tracked and lit from below by a man holding a fixture with four flood lights. She is on the stairs - he is not. But when Norma stops at the bottom of the staircase for her close-up, the man with the lights is now suddenly on the staircase with Norma standing behind her.