When Struck and Inspector Deming tumble down the stairs together, Wade Boteler's (Deming's) stunt double's hat comes off, revealing him to be balding. At the bottom of the stairs though, Deming has a full head of hair.
Peter's surname is sometimes presented as De Haven and sometimes as DeHaven (as is listed in the credits).
When Christine faints in the doorway of her bedroom, a hand can be seen briefly appearing behind her to catch her as she falls.