Continuity mistake: The opening of the show starts with Magnum driving off with the iconic Ferrari; however it has a license plate number, 56E-478, which is not the one seen in 99% of the show. It comes from the pilot episode, where the vanity plate ROBIN-1 had yet to be introduced.
Magnum, P.I. (1980)
1 continuity mistake in show generally - chronological order
Starring: Tom Selleck, Roger E. Mosley, John Hillerman, Larry Manetti
Don't Eat the Snow in Hawaii - S1-E1
Continuity mistake: When Magnum drops the ring out of the envelope, nothing is near it as it's shaking. In the close up shot, it's next to keys. (00:44:20)
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