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* AwardSnub: Neither Dean Stockwell nor Scott Bakula never won Emmys for their work (in all fairness, they picked up a decent amount of other awards and nominations).
* AssPull: In "Deliver Us From Evil," the Evil Leapers came closer to undoing Sam's hard work than just about anyone else. And towards the end, Alia had almost completely [[spoiler: destroyed the La Motta family, with Raymond having an affair with a co-worker, Jimmy being falsely accused of rape, and almost no hopes of Sam being able to save the day]]. Despite all of that, however, Sam manages to [[spoiler: give Alia a speech on duality and the two of them being counterparts and somehow manages to save the day and undo all the damage the the Evil Leapers have caused with some kind of time warp]]. Considering how ''Quantum Leap'' has never relied upon Deux ex Machina endings in the past and the fact that there was absolutely no realistic way for Sam to reverse all the damage Alia had done, Sam [[spoiler: giving a rambling incoherent speech on duality to Alia]] hardly seems like a believable way to resolve everything and give the La Mottas their happy ending back.
* BadassDecay: Sam undergoes some of this in Season 5. From Seasons One to Four, he was the quintessential action hero, going up against a wide array of foes, including mobsters, professional boxers, biker gang leaders, corrupt cops, rapists, and a multitude of criminals and dangerous ruffians, and beat them all. Come Season Five, however, Sam noticeably gets beaten around and roughed up much more. The season debut saw him get beaten down so badly by Lee Harvey Oswald's commanding officer in a bar fight that Sam had to resort to pulling a gun on the man in order to save himself. The Evil Leaper episodes also saw him repeatedly get pushed around, first having trouble fighting against a college frat boy and then getting kicked around mercilessly in a women's prison. Also, when he leaped into Elvis, Sam got into a fight with a woman's jealous fiancee, in what would be his final fight for the series, and got beat down in a humiliating fashion(even though he had proven quite capable of defeating jealous boyfriend/ex-husband/fiancee types in past episodes). While it is conceivable that the Swiss Cheese Effect had denied him a lot of his martial arts abilities in many of these episodes, his portrayal in Season 5 is still somewhat jarring compared to the badass action hero he was in the first four seasons.
* BellisariosMaxim: While the show is the trope namer, there's probably no better explanation than the Maxim for why Al is occasionally able to do things he really shouldn't be able to as a hologram (things like riding in a car or walking up stairs).
* BrokenBase: Bellisario has said that, based on the responses he saw, half the fans loved "Mirror Image" and half hated it.
* CrowningMusicOfAwesome: The show's Theme song.
* DryDocking: Sam did not have a wife waiting for him in the event that he ever returned home. [[FanonDiscontinuity No, he didn't!]]
* FanficFuel:
** Sam's leaps post-finale, and Al's role in them now that he's [[spoiler:married to Beth]].
** Alia's life as a leaper after [[spoiler:escaping Lothos at the end of "Revenge,"]] and whether or not she encounters Sam (or Zoey) again.
** The premise behind the proposed "Bold Leap Forward" spinoff, which would have seen Sammie Jo Fuller becoming a leaper to find Sam.
** Any information behind the evil leaping project, including who they were and ''why'' they were evil.
* {{Fanon}}: Given that the show ended without tying up certain loose ends, the show has steadily built some fanon over the years, some of which has made its way onto the ''Quantum Leap'' Wikia for whatever reason (mostly because there is very little canon info available).
** Gushie's real name was never revealed on the show, but a fanfic named him "Dr. Irving Gushman" and the fandom adopted it.
** There's a lot of fanon about the evil leaping project.
*** For instance, there's a "picture" of Lothos circulating the Internet that is actually a picture of Ziggy from "The Leap Back," except tinted red. Lothos was never actually seen on the show, but given that he's Ziggy's EvilCounterpart, he should look ''something'' like her, right?
*** There's also a widely accepted theory (again, from [[http://www.quantumleap-alsplace.com/quantumretribution/main.html a fanfic series]]) that Lothos is actually a mad scientist in the British Isles who did some BrainUploading into a supercomputer.
** In fact, a lot of fanon that is (incorrectly) claimed as canon comes from the more fanfic-y elements of the [[http://www.quantumleap-alsplace.com/mainpage.html "Al's Place" fansite]], which was the ''only'' fansite for ''Quantum Leap'' for several years.
* FanonDiscontinuity: The ExecutiveMeddling-born ending. "Sam Becket (sic) [[ExactWords never made it home]]." I don't know who ''he'' is, Sam ''Beckett'' did!
* GermansLoveDavidHasselhoff: The series was very popular in Mexico, partly due to the premise and also because of the [[SuperlativeDubbing really good voice acting of the Mexican dub]].
* GrowingTheBeard: "The Color Of Truth" is widely considered the point where the show really began to hit its stride, especially by the cast. It's notable that it's the first episode to use the full leaping effect, as opposed to a simple blueing of the screen used for the earliest episodes.
* HarsherInHindsight: In "Permanent Wave," Sam has to save a boy that witnessed a man being shot to death in a matter involving drugs. The character's name was Phil Hartman. It wasn't too many years later when actor Phil Hartman was himself shot to death by his wife, who had a drug problem.
** In "Jimmy," Sam and Al both freely use the word "retarded" to describe the titular leapee, who appears to have Down Syndrome. [[ValuesDissonance At the time]], "retarded" actually was the clinical terminology for a person with Down Syndrome, but like "moron" and "imbecile" it became exclusively insulting over time.
** The already heavy episode "Raped" in which Sam leaps into a rape victim who's both [[SlutShaming slut shamed]] and [[UsefulNotes/VictimBlaming blamed]] for her assault, while her attacker is defended and given sympathy becomes harsher and more poignant today where rape culture has become much more apparent especially cases such as Steubenville.
** "A Little Miracle" is YetAnotherChristmasCarol, with Sam and Al trying to reform one Michael Blake (Charles Rocket). The Christmas Future part of their attempt involves convincing Blake that he committed suicide. During his HeelRealization, Blake openly laments the thought of dying alone. In 2005, Rocket was found dead in a field, and it was ruled a suicide.
** "The Boogieman" is an AllJustADream episode where Sam faces Satan. "Mirror Image" casts a new light on the exchange after Satan asks Sam why he keeps putting right what was made wrong.
--->'''Sam:''' I'm just trying to get home.\\
'''Satan:''' Well, it looks like you're not going to make it.
* HilariousInHindsight: Weathers Farrington's (played by J.G. Hertzler) contemptuous "''What do you'' know of honor Dumont" is ''absolutely'' hilarious when you know that he went on to play the Klingon general Martok in ''Series/StarTrekDeepSpaceNine.''
** Doubly funny as he's saying this to Sam. A few years after ''Series/StarTrekDeepSpaceNine'' ended, Hertzler appeared in the ''Series/StarTrekEnterprise'' episode "Judgment," where his character and Archer discussed honor and Archer helped him rediscover his own sense of honor.
** In "All Americans", Al mentions that he's watching Super Bowl XXX and that the Pittsburgh Steelers are trailing by three points. Jump head six years to the real Super Bowl XXX, where the Steelers ''were'' playing and ''did'' trail by three points until a miraculous comeback in the final minutes.
** In "Killing Time," the lawman in charge of bringing Leon Styles (Sam's current leapee) to justice is named [[Film/TheTexasChainsawMassacre2003 Sheriff Hoyt]].
** In the PilotMovie, the swiss-cheesed Sam initially thinks his experiences are a dream of some kind. In his narration, he remarks he's just waiting for a boogieman of some kind to pop out to scare him and end the dream. That's pretty much what happens in the HalloweenEpisode.
** In one episode, Sam gives advice to a young boy about investment in real estate when he's driving a taxi. In a twist, that boy is then revealed to be Donald Trump. As Trump's prominence has grown over time (for better or worse depending on your own political views) the accidental historical significance of that leap has grown along with it.
** In "Stand Up" Sam has to do a comedy dual act with a partner played by Creator/BobSaget, in the midst of his ''Series/FullHouse'' fame. Saget gets into an argument with his love interest over sex jokes, she balks at it but he is enthusiastic about being more risque. In later years Saget famously shredded his family friendly image with quite profane material.
* IdiotBall: Sam's established tendency to follow his heart and act on his own feelings rather than focusing solely on the mission at hand graduates to a full-fledged grab for the Idiot Ball in "Deliver Us From Evil," in which he leaps back into Jimmy Lamotta and meets "evil leaper" Alia (who has leaped into Connie Lamotta). Even though Al tells him that the timeline has changed that the Lamotta family completely falls apart, Sam is so excited and happy to meet a fellow leaper that he doesn't stop to consider the very real possibility that Alia is the reason that the family's happy future has been overwritten. Sam's failure to regard Alia or the situation with any objectivity nearly gets Jimmy institutionalized, then ''murdered'', before it's all finally sorted out near the end of the episode.
* ItWasHisSled:
** ''Al'' being the one that Beth leaves for another man in "M.I.A.". It's such common knowledge among fans that you'd forget that the way the episode is structured, it's supposed to be a twist - with Sam stumbling upon a picture of young Al in Beth's home about halfway through. (Beth actually introduces herself to Dirk as Beth Calavicci early on, but since Al is mostly referred to by his first name throughout the show, viewers may be forgiven for missing the connection until it's pointed out.)
** The same thing occurs in "Deliver Us From Evil." It's common knowledge that this is the episode that introduces Alia the Evil Leaper, yet the way it's structured, it starts off looking like a sequel to the episode "Jimmy" (with an added mystery about the good history somehow being rewritten). Even Zoey's first appearance simply looks like Connie Lamotta is talking to a friend or neighbor instead of a hologram.
* JerkassWoobie: Alia. We don't know much about her life prior to quantum leaping, but she's a particularly duplicitous piece of work in "Deliver Us from Evil." That said, as the Evil Leaper episodes progress, it becomes clear that her only "friend" is a sociopathic hologram, that she's been conditioned to think that [[ForcedIntoEvil evil acts are her eventual ticket home]], and that any failure on her part will be met with torture and/or termination. By the time of her HeelFaceTurn, she's shucked off the "jerkass" part and has become a straight-up {{Woobie}}.
* {{Narm}}: When Lee Harvey Oswald sees his face in the Waiting Room (actually Sam's face), he understandably [[FreakOut freaks out]]... but we cut to Sam, mouth open, with Oswald's slightly-deadpan scream pouring out.
* OlderThanTheyThink: In the second season finale, "M.I.A.", the tearjerker ending has Al sitting with his wife, who thinks him dead, as she listens to "Unchained Melody" by the Righteous Brothers. She then switches to "Georgia On My Mind" by Ray Charles, and begins dancing alone, and Al joins her as best he can in his hologram form. Briefly, just as the leap occurs, she senses him with her. This scene, particularly with the use of "Unchained Melody", may seem to have been heavily inspired by ''Film/{{Ghost}}'' but in fact aired May 9, 1990, 2 months before ''Ghost's'' July 1990 release.
* RetroactiveRecognition: The youngest daughter in "Another Mother" (and Bellisario's real-life daughter) later became [[PrettyLittleLiars Spencer Hastings]].
** One of the Frat Boys in ''Animal Frat'' is played by Raphael Sbarge, the future voice of [[VideoGame/KnightsOfTheOldRepublic Carth Onasi]] and [[VideoGame/MassEffect Kaidan Alenko]].
** Creator/TeriHatcher appeared in the first season episode "Star-Crossed".
** Creator/AnnaGunn appeared in the fourth season episode "The Play's the Thing".
* TheyChangedItNowItSucks: On the DVD releases, a large number of the original songs were changed for copyright reasons (the songs were usually [[NothingButHits well known songs from the time period that a particular episode is set it]]), which caused a HUGE backlash from fans. In particular, the last episode of the second season, "M.I.A.", removed Ray Charles' "Georgia On My Mind" with some generic muzak, ruining what many thought was the best moment of the entire series (Al, in hologram form, dancing with his first wife who left him while he was a POW in Vietnam). This is definitely a instance in which TropesAreNotBad.
** The Season 5 arrangement of the theme song, meanwhile, wasn't very well-received by fans (Universal brought back the original version for "Mirror Image").
* TheWoobie: Sam and Al so much, at least in their original backstories:
** Sam loses his father and brother when he's in his late teens and his sister marries an abusive husband. His fiancée leaves him at the altar on his wedding day. And thanks to ChronicHeroSyndrome, he's left bouncing around in time.
** Al's mother leaves him at a young age and his father is forced to emigrate to find work, leaving Al in and out of an orphanage. His younger sister dies in an institution and he loses his father. After joining the Navy, he ends up missing in action and his first wife, Beth, assumes him dead and marries someone else, leaving Al spending the rest of his life attempting to fill the void.
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