Continuity mistake: When Magnum answers the phone call from John Costa he's wearing the new shirt with a striped colorful pattern, which was a birthday present from his mother. During Magnum's introduction to Costa in the alley, the style of Magnum's shirt is the same, but the striped pattern has changed. Then the pattern changes again when Magnum returns home bruised. (00:26:25)
Magnum, P.I. (1980)
1 continuity mistake in Forty
Starring: Tom Selleck, Roger E. Mosley, John Hillerman, Larry Manetti
Revealing mistake: One of the party guests opens the door of the fridge and you can see behind the set instead of looking into the fridge. (00:32:40)
Higgins: How fiendishly deceptive of you, Magnum. I could have sworn I was hearing the emasculation of a large rodent. To my great surprise, I see the sounds are emanating from what I thought was a harmless musical instrument.
Magnum: Cute Higgins, real cute.
Higgins: Why Magnum? Why do this terrible thing?
Magnum: Higgins, I'll have you know I used to be very good. I was the second best sax player in my High School band!
Higgins: Well, how many sax players were there?!
Magnum: ...Anyway. I just saw this in a pawn shop window and thought I'd like to try and get my chops back.
Higgins: May I suggest that your "chops" are irretrievable.
Magnum: Higgins, did you come here just to abuse me!? (00:05:25)
Trivia: Tom Selleck is the only actor to appear in every episode of the show.