* AlternativeCharacterInterpretation: Is Magnum good or evil? The show plays with both, as Magnum is a {{hero}}, but can be ruthless.
** Is Higgins a JerkWithAHeartOfGold or just a JerkWithAHeartOfJerk? He doesn't really seem to like Magnum and doesn't really try to help that much (see "Thank Heaven for Little Girls and Big Ones Too" and "Tropical Madness").
*** Higgins more slowly warmed up to Magnum. After all, he is very British and Magnum is an American SurferDude.
* AwesomeMusic: The opening theme music by Mike Post.
** The original theme by Ian Freebairn-Smith is also pretty catchy.
* CompleteMonster: Colonel Ivan in "Did You See the Sunrise?", arguably the worst in the show's history. Not only did he torture Magnum, Rick, and T.C. in Vietnam, but he comes back years later simply to [[ForTheEvulz finish the job]], eventually [[spoiler: brainwashing T.C. to kill the others]]. Is it any wonder Magnum does what he does in the end?
** [[spoiler: Quang Ki]] is right up there too. Sure, Magnum ''did'' [[spoiler: kill his brother to save Michelle]], but in revenge, he nearly [[spoiler: fatally shoots Magnum, escapes prosecution for said shooting, and kills Michelle with a car bomb, with Lily just narrowly escaping in time. The fact that he's never punished for any of this makes him a particularly nasty KarmaHoudini as well.]]
* CrossoverShip: Almost a canon example. The end of the ''Series/MurderSheWrote'' crossover teased Higgins and Jessica Fletcher, although it never went past Higgins quite obviously crushing on Jessica, to her (and Magnum's) amusement.
* HilariousInHindsight: The bad guy in "Don't Say Goodbye" is played by [[spoiler: Ted Danson, several years before he and Tom Selleck were two of those ''Film/ThreeMenAndABaby''. Unfortunately Steve Guttenberg never appeared on the show to complete the set.]]
** "Holmes Is Where the Heart Is" sees Higgins (all but literally) assuming TheWatson role alongside his friend David Worth ([[NapoleonDelusion who thinks he is Sherlock Holmes]]). John Hillerman would later actually play Dr. Watson in the 1990 TV movie ''Hands of a Murderer'' alongside Creator/EdwardWoodward as Holmes.
** "The Return of Luther Gillis": [[Film/{{Spaceballs}} "Who's Dot Matrix and what's she got to do with this?"]]
* HoYay: Between Rick and T.C.
* TheScrappy: While intentionally written to be annoying, Cassie Yates' characters in "Kiss of the Sabre" and "Photo Play" aren't well-liked by fans.
** To a lesser extent, some fans aren't fond of Luther Gillis and Carol Baldwin for similar reasons.
** Goldie Morris in "Old Acquaintance" is seen as a Scrappy GirlOfTheWeek due to her SoapBoxSadie character.
** Pamela Bates in "Novel Connection", as not only does she not tell anyone why someone's trying to kill her (''[[PotHole after]]'' [[WhatAnIdiot an attempt's been made, mind you]]), but she's an absolute JerkAss to Magnum to boot.
* SocietyMarchesOn: In "Skin Deep", Magnum says that women don't shoot themselves, hence his suspicions concerning Erin Wolfe's supposed suicide. While suicides by gun among women are still uncommon, the deaths of [[https://en.wikipedia.org/wiki/Shauna_Grant Shauna Grant]], Creator/MaryKayBergman and others have made Magnum's words [[HarsherInHindsight ring quite hollow today.]]
* ThrowItIn: "Don't Say Goodbye": Magnum pushing Amy Crane into the water then jumping in himself once confronted with [[spoiler: Stewart]]'s boat hook was ad-libbed by Tom Selleck. It wasn't part of the script, but was left in at Selleck's insistence.
* UnintentionallyUnsympathetic: Subverted. In "Blind Justice", Magnum discovers that the man on trial for murdering his wife [[spoiler: is actually innocent ([[DrivenToSuicide she had committed suicide after years of his abuse]]), but that he had also gotten away with a different murder years earlier. When confronted with this fact by Magnum, the wife's mother, while her reasons are totally sympathetic, staunchly defends her cover-up of the suicide to get her son-in-law on trial. What even the episode itself doesn't touch on, however, is that the person whom the husband ''did'' murder [[FridgeHorror likely had a family themselves and who would be denied justice by the mother-in-law's actions]], though [[NoEnding the episode ends before the trial's verdict.]]]]
* ValuesDissonance: Even though it was an [[{{Homage}} homage]] to the original Sherlock Holmes stories, there is no way ''in hell'' Patrick [=MacNee=] in [[{{Yellowface}} yellowface]] disguise would fly on television today.
** Ivan calling T.C. by the "N" word in flashbacks was controversial even for the 1980s, but it certainly won't be said on U.S. network television now.