The house that was used for the exterior shot of the Stanger home is the same that was used as the Barkley house in the TV series The Big Valley.
When Kim sits down to play the piano, the music that is heard very obviously does not match his hand movements on the keyboard.
Alfred Hitchcock: Good evening. Have you ever had a premonition? A feeling that something dreadful was about to happen? I mention that, obviously, because tonight's play is about a young man named Kim Stanger. About his strange home coming and of the mystery he found when he arrived. Follow him, if you will, as he attempts to unravel this mystery, hindered at every step by his friends and haunted always by a vague sense of foreboding. This story is appropriately entitled "Premonition". I defy you to guess the nature of Kim Stanger's premonition, although we shall give you numerous clues in the prologue which we now present immediately.
Alfred Hitchcock: And as the cold New England sun slowly sinks behind the coroner's office, we take leave of mysterious, far-off Sheridan Falls, land of enchantment. And as the night breeze carries our little craft away from these beautiful wooded shores, we slowly turn our eyes back to the charms of television advertising and the lyrical chant of our sponsor's message, after which I'll float back. (Fades to commercial.)
Alfred Hitchcock: I see it's time for our intermission. You may leave your seats if you wish and ah... have some light refreshment, chat with your friends, but please hurry back for our next play. That will be in just ah...(Looks at his wrists for a watch.) One week. Good night.
Doug: Hamlet, the ghost…
Allusion: Doug is alluding to Shakespeare's play "Hamlet" in which a brother kills his father, and the father's ghost appears to the other son, seeking vengeance.