Continuity mistake: In the scene right after Shelly's funeral when Kate and 'Adam' are talking by his car, he goes to kiss her when they are done. He tries to kiss her on the lips, but she moves to the side. At first he is kissing her on the left cheek and when the camera changes positions, he is kissing her on her right cheek.
Question: I don't get the ending. We see Adam shot the masked person who is Dorothy, so I figured the killer was Dorothy, but reading a correction entry it states that it's obvious the killer was Adam. If the killer was Adam then how did he get Dorothy in the suit and mask and then make her attack her friend before shooting her?