* ''Quantum Leap'' has several references to producer Creator/DonaldPBellisario's previous series, ''Series/TalesOfTheGoldMonkey'', including a character named "Gushie". "Ghost Ship" featured a Captain Cutter, which was the name of the main character in ''Tales of the Gold Monkey''.
* Sam has leaped into nine women: a secretary, a divorced mother of three, a beauty pageant contestant, a pregnant teenager, a rape victim, a singer in a teenage girl group, a housewife during the women's movement, Dr. Ruth Westheimer, and an inmate in a women's prison.
* Sam Beckett and show creator Donald P. Bellisario both share the same birthday of August 8.
* Sam has leaped out of the United States seven times: Egypt, Vietnam, a plane over the Bermuda Triangle, Japan, the Soviet Union, a raft in international waters, and England. If Virginia in 1862 is counted (as it was part of the Confederate States of America at the time), this brings the total to eight.
* Sam leaped into the year 1958 eight different times, which made it the most leaped into year during Quantum Leap's entire run.
* Sam leaped into every year from 1953 through 1987 at least once, except the years 1977, 1984, and 1986.
* Quantum Leap came close to being canceled in its third season due to low ratings. However, a letter writing campaign helped save the series and enabled it to continue for two more years.
* Throughout the series, Sam meets many "future" famous people including: Buddy Holly; Music/MichaelJackson; Creator/MarilynMonroe and Bill Clinton, as well as leaping into Lee Harvey Oswald and Music/ElvisPresley.
* Creator/DeanStockwell was the first to "Leap" through time on an episode of the ''TheTwilightZone''- "A Quality of Mercy", playing a war-hungry US Lt. in August, 1945.
* Sam Beckett is revealed to have attended MIT, and his friend and guide Al Calavicci is mentioned to have also spent some time there.
* Al Calavicci drives two different Ferarris in the series: in "Genesis: Part 1", he is in a red Testarossa (which is shown from very low angles so as to keep the identity of the car hidden), and in "Killin' Time", he is driving a 512 BB Convertible conversion.
* Ranked #15 in TV Guide's list of the "25 Top Cult Shows Ever!" (30 May 2004 issue).
* The character 'Sam Beckett' was ranked #12 in TV Guide's list of the "25 Greatest Sci-Fi Legends" (1 August 2004 issue).
* Season One's cliffhanger into Season Two was the teaser for "What Price Gloria?". The next season, three other episodes premiered before "What Price Gloria?" aired.
* There were several ideas for episodes which ultimately were never used. One had Sam leaping in as Robert F. Kennedy. Another idea would involve an animated episode. The producers even toyed with the idea of leaping Sam in as a baby. Also, Donald P. Bellisario wanted to do an episode where Sam leaps in as Thomas Magnum (from ''Series/MagnumPI''). It is unclear why that episode never materialized, although in an earlier episode, a character is seen watching "Magnum, P.I.", thus establishing that show as fiction within the Quantum Leap "universe".
* Al's cigar was the idea of actor Dean Stockwell, who said it was "a good way to get free cigars for five years".
* Donald P. Bellisario's favorite of all his TV shows.
* Scott Bakula ad libbed the line "Oh boy!" at the end of an episode. The producer liked it so much that it became the signature final line of each episode, as Sam finds himself in a new body.
* Al's call-sign (pilot nickname) is "Bingo".
* Sam leaped outside his life a total of four times. Two of the leaps were explained. In "The Leap Back" Al and Sam traded places due to an accident, which allowed for leaping withing Al's life. "The Leap Between the States" revealed that Sam's great-grandfather had a very similar genetic profile and blood type. Two unexplained leaps before his life were "Play It Again, Seymour" (April 14, 1953) and "The Americanization of Machiko" (August 4, 1953), as the series finale revealed Sam's birth-date as August 8, 1953.
** However, both were after he had been conceived (which would have been at the end of 1952), so he did technically exist at that point.
* Sam leaps into August 8, 1955 ''twice'' ("The Color Of Truth" and "Trilogy, Part, 1").
* In "Lee Harvey Oswald", Sam, as Oswald in 1959, has a run-in with a certain Marine named "Bellisario". Series creator Donald P. Bellisario did in fact serve alongside Lee Harvey Oswald in the Marines.
* Creator/DonaldPBellisario took the idea for the series from a scrapped premise for ''Series/{{Galactica 1980}}'', where the villain would have continued traveling through time after the first episode and the ''Galactica'' crew would have to prevent him from altering history for the worse. Which might make this series the only good thing that ever came out of ''Galactica 1980.''
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* ActorAllusion: When Sam leaps into a college fratboy, the Dean whose office he and his friends regularly break into is called "Dean Stockwell".
** A very subtle one in the episode "A Leap for Lisa" with the casting of Roddy [=McDowall=] as Sam's guide after Dean Stockwell's Al is RetGone. Both [=McDowall=] and Stockwell started out as child actors in TheForties who grew up to lead long, respectable adult careers as actors. So in a world where Dean Stockwell doesn't exist, replace him with the actor who has a similar career path but shares next to nothing else in common.
** "The Leaping Of The Shrew" features Sam being [[TheBlueLagoon shipwrecked on an island]] with a spoiled girl [[TheBlueLagoon played by Brooke Shields]].
** John Cullum guest stars playing a boozy actor who is playing the character Don Quixote in ''Man of La Mancha''. Cullum performed the same role on Broadway for many years.
* DirectedByCastMember: Scott Bakula directed several episodes.
* EditedForSyndication
** Following the pilot, episodes would open with a Sam voice-over and montage referring in some way to the previous leap. The series abandoned this convention roughly halfway through the second season -- likely in order to make it possible to air episodes out of sequence. When the series went into reruns, this trope kicked in -- with the stated openings being dropped. They were replaced with the familiar "...will be the leap home" opening narration and the "Oh, boy!" scenes.
** In the summer between the first and second seasons, NBC ran a one time only 90 minute recut version of the pilot featuring only the first leap and editing out the baseball leap.
** In reruns, the first three seasons always had the opening sequence made for Season 4.
** In the version of the pilot aired on G4, the trademark [[Film/TheNatural lighting strike]] that came after Al's line "Yeah, well, you ain't Roy Hobbs ether!" is missing. It's such a small cut that it doesn't seem to be made for time reasons.
* TheCastShowoff
** Sam leaps into a lot of musicians and dancers, the better to showcase Scott Bakula's impressive musical chops.
** Dean Stockwell also had opportunities now and then, such as when Al showed Sam how to dance at a Jewish wedding.
** And then there was the episode where Al rapped...
* MissingEpisode: Some episodes aren't on Netflix, like "Heart of a Champion". It was actually much worse before 2016. Among the missing episodes were the first and last ones.
* NamesTheSame
** Commander Dirk Riker.
** In the teaser for "What Price Gloria?", Sam is happy to find out he has leaped into someone also named Sam. He's less happy though, when he finds out its short for "Samantha".
* TheOtherDarrin: Sam's father was usually played by Scott Bakula, except in his first appearance where he's played by a different actor.
* TalkingToHimself: One episode features Sam leaping into a younger Al. Al speaks to his younger self in 1999, with Dean Stockwell's voice dubbed over for the younger actor.
* ThrowItIn: When asked at a convention whether either of them improvised on-camera, Bakula replied "I think it's safer to ask does Dean ever say any of the lines that are in the script?"
* TropeNamers: ''Quantum Leap'' has named:
** BellisariosMaxim[[invoked]]
** SetRightWhatOnceWentWrong
*** By extension, MakeWrongWhatOnceWentRight
* UnfinishedEpisode: There were going to be episodes where Sam leaps into an animated character and a dog.
* WhatCouldHaveBeen: One of the episodes Donald Bellisario was planning for ''Quantum Leap'' before it was canceled was for Sam Beckett to leap into Thomas Magnum, thus merging the ''Series/QuantumLeap'' continuity with that of ''Series/MagnumPI''. They apparently ''did'' film the initial "leaping in" scene, with Scott Bakula in the familiar red Hawaiian shirt turning to the camera and doing Tom Selleck's famous comical eyebrow raise from ''Magnum, P.I.'''s opening credits. This would have resulted in a CelebrityParadox, since in "Another Mother", a character is seen watching ''Magnum'' on TV.
** Or not, as according to the ''Starlog'' publication ''100 Years of Science Fiction'' the plan was for Bakula to leap into the body of Tom Selleck as he filmed the series, not the character.
** The original scene for the finale has recently resurfaced, showing instead of the infamous [[FanNickname Black Screen Of Death]], it showed a photograph of Al, Beth and their daughters in the present day.
** Another planned leap that was never produced would have had Sam enter the body of ... a cartoon character?
* WordOfGod: Bellisario stated that [[spoiler:despite Sam changing history to keep Al and Beth together, the Project would still exist and that Al would remain a crucial part of it]].
* YouLookFamiliar
** Carolyn Seymour plays Priscilla in "A Portrait for Troian" and evil hologram Zoe in Season 5. The series can actually get around the similarity in this instance because (aside for brief moments) Sam and Al never see what Zoe looks like.
** "Mirror Image" is partially built on this trope, with Sam encountering people that look like ones from previous leaps -- John D'Aquino (Tonchi for Frank) and Richard Herd (Ziggy for Moe Stein). Notably, while Bruce [=McGill=] played both Weird Ernie and Bartender Al, Sam doesn't notice any familiarity.
** Willie Garson appears in "Play It Again, Seymour" as the titular Seymour and in "Lee Harvey Oswald" as Oswald.
** Olivia Burnette plays the older daughter of Sam's housewife leapee in "Another Mother" and Sam's sister Katie in "The Leap Home".
** Charles Rocket plays Michael Blake in "A Little Miracle" and Commander Riker in "A Leap for Lisa".
** Sloan Fisher plays the man in the mirror that Sam has leaped into in "How the Tess Was Won" and later the same season plays a stagehand in "Blind Faith."
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