* ActorAllusion: One episode is an AffectionateParody of ''Film/RaidersOfTheLostArk'', a movie Tom Selleck was considered to do the lead in, but gave up to do this show instead.
** The opening dream flashback in "Tigers Fan" has a character talk about how "Jim [[[Series/TheRockfordFiles Rockford]]] was being driven nuts by this pain-in-the-butt named Lance White". Lance White was played on that show by Tom Selleck.
** In "Luther Gillis: File #001", [[Creator/OrsonWelles Robin Masters]] leaves a message on Magnum's machine, telling him the personal access code needed for his next assignment's computer is [[Film/CitizenKane "Rosebud"]].
** In "The Legacy of Garwood Huddle", John Ratzenberger's character has a friend named [[Series/{{Cheers}} Norm]].
** In "Italian Ice", Magnum is choked pretty badly by the Marchese's bodyguard, played by [[Characters/TheGodfather Lenny Montana]], whose most famous character was [[Film/TheGodfather garroted to death]].
* {{Blooper}}: The ending credits could never seem to spell poor Buck Greene's name right.
* CreatorCameo: Creator, writer, and producer DonaldPBellisario appears as the desk clerk of the Low Surf Hotel in "Faith and Begorrah".
* TheDanza: Tom Selleck as Thomas Magnum.
** John Hillerman as Jonathan Quayle Higgins.
* DescendedCreator: Bob Minor, stunt coordinator and double for Roger E. Mosley, plays T.C.'s friend Ron Pennington in "Round and Around", [[spoiler: who is soon murdered. Hilariously, Minor later appears in the same episode's climax as Mosley's double, effectively [[FridgeBrilliance avenging his own death]].]]
* EditedForSyndication: In addition to TitleSequenceReplacement, some episodes lack scenes originally seen in the network airings (such as the opening scene of "Basket Case"). But that's nothing compared to the [=DVDs=]...
** The original network broadcast of "Never Again... Never Again" actually had Magnum [[spoiler: [[http://magnum-mania.com/Episodes/Season1/Never_Again_Never_Again.html shoot Lena Greenberg dead (offscreen), with the shot heard over a cutaway of the boat they're on.]] This fact helps the next scene (of Magnum on the beach contemplating the episode's events) make much more sense. Syndication and the season one DVD set removed the gunshot sound, however, leaving the viewer confused as to what happened to Lena. It wouldn't be likely that she surrendered to Magnum on the spot, as by then she had [[OneManArmy single-handedly killed]] at least two men Magnum's size [[NotSoHarmlessVillain with only a scalpel]].]]
* FakeBrit: John Hillerman, a native Texan, playing a retired British Army Sergeant Major -- and playing him so convincingly even ''British'' viewers thought he was a genuine Brit.
** In "Luther Gillis: File #001", Higgins insists on accompanying Gillis into a cowboy bar. When Gillis says they won't talk to a "limey", Higgins grabs Gillis by the lapels and intones "Who you callin' a ''limey'', boy?" in a broad Texas drawl. He played the whole bar scene this way.
* FakeNationality: The Italian Marchese in "Italian Ice" is played by French actor Jean Claudio, whose natural accent [[OohMeAccentsSlipping slips through]] in his English dialogue.
** Mexican Mafia king Pasqual Valez in "On the Fly" is played by American Byrne Piven, father of actor Jeremy Piven.
** Many Chinese-American or Chinese-Hawaiian actors play Japanese or Japanese-American characters, and vice versa.
* RealLifeRelative: Tom Selleck's ex-wife Jacqueline Ray appears in two episodes, and current wife Jillie Mack appears in three episodes.
** Tom's father Bob Selleck plays Magnum's Grandpa Everett in the home movies seen in the opening of "Going Home", as well as in the baseball flashback scene in "Infinity and Jelly Doughnuts", along with Tom's mother Martha and his son Kevin.
** Larry Manetti's wife Nancy [=DeCarl=] appears in two episodes.
** Producer DonaldPBellisario's then-wife Deborah Pratt played T.C.'s girlfriend Gloria in four episodes.
** Real-life couple John [=McCook=] and Laurette Spang-[=McCook=] play husband and wife in "The Case of the Red Faced Thespian".
* ScienceMarchesOn: "Wave Goodbye", while otherwise a [[ValuesResonance well-aged]] episode, is incredibly dated in that the police are unable to determine who [[spoiler: raped Kacy before killing her]], as the episode aired in 1981, well before DNA forensic testing became the norm.
* TechnologyMarchesOn: Naturally, given the time period.
** The video game seen at the start of "Little Games" is too advanced for the time, but looks hilariously dated now.
* TheOtherDarrin: DA Carol Baldwin was played by Patty [=McCormick=] in the character's first appearance and by Kathleen Lloyd in twenty episodes.
** Walter Chotzen played Icepick in his first appearance, before being replaced by Elisha Cook Jr. for the rest of the series.
** Ed Russler was played by Burr [=DeBenning=] in "The Jororo Kill", and by [[Film/EnterTheDragon John Saxon]] in "Jororo Farewell".
* WhatCouldHaveBeen:
** The producers actually planned to reveal Creator/OrsonWelles as Robin Masters when the series ended. Unfortunately, though, Welles died in 1985 before the storyline could materialize.
** Don Bellisario's later show ''Series/QuantumLeap'' was going to have a crossover episode, but unfortunately the ''Magnum'' series was established as existing within that show's universe, and he preferred to avoid the CelebrityParadox.
** Jack Lord was approached several times to appear on the series, but he never did (in fact, once ''Series/HawaiiFiveO'' ended he never acted again[[note]]except for a cameo in ''M Station: Hawaii'', an unsold pilot which he also executive produced[[/note]]).
* WrittenByCastMember: Roger E. Mosley co-wrote "Missing Melody," one of the few episodes of the series to focus on his character of T.C.
* YouLookFamiliar: ''Tons'', like Gillian Dobb appearing as different characters in "Mad Buck Gibson", "The Elmo Ziller Story", and "Ki'i's Don't Lie" before finally appearing as Agatha Chumley in "Black on White".
** Glenn Cannon playing another doctor, Dr. Kessler in season one's "Never Again... Never Again", before appearing as Doc Ibold in season two's "Try to Remember".
** Lance [=LeGault=] as John W. Newton in "Missing in Action" before appearing as Colonel Buck Greene in "Memories Are Forever". [[BadassBaritone The voice]] helps.
** Paul Burke as Admiral Kitchner in "Memories Are Forever" before appearing as Admiral Hawkes in "Did You See the Sunrise?".
** Kathleen Lloyd as Bridget Archer in season three's "Almost Home" before appearing as Carol Baldwin in season four's "Distant Relative".
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