Man who got shot near the end of the movie is clearly breathing when the killer is shown going to the stairs.
Corpses in the freezer aren't pale like they should be if they were in the freezer.
At 66 minutes, a crew member can be seen holding the mirror that is causing the sun's reflection.
George could not have been able to take credit for Peggy's death as she was shot while he was still in their bedroom.
At 22 minutes, Isabel's reflection in the glass matte painting featuring the beach house is visible before she enters the frame.