!!Listed Trivia:

* AccidentallyCorrectWriting: In "[[{{Recap/StarTrekS1E19TomorrowIsYesterday}} Tomorrow Is Yesterday]]", the ''Enterprise'' travels back in time to 1968. It's mentioned that "an important assassination" will take place. Martin Luther King Jr. and Robert Kennedy were both assassinated later that year.
* ActingForTwo:
** Creator/WilliamShatner plays both Kirk and sinister-impostor-Kirk in "[[Recap/StarTrekS1E5TheEnemyWithin The Enemy Within]]" (transporter accident), "[[Recap/StarTrekS1E7WhatAreLittleGirlsMadeOf What Are Little Girls Made Of?]]" (robot double), "[[Recap/StarTrekS2E4MirrorMirror Mirror, Mirror]]" (mirror universe), "[[Recap/StarTrekS3E14WhomGodsDestroy Whom Gods Destroy]]" (shapeshifter), "[[Recap/StarTrekS3E24TurnaboutIntruder Turnabout Intruder]]" (body swap), and ''Film/StarTrekVITheUndiscoveredCountry'' (alien shapeshifter).
** Shatner also does brief double duty in "[[Recap/StarTrekS1E29OperationAnnihilate Operation: Annihilate!]]", in the scene where Kirk discovers the body of his brother Sam.
** A quirk of production: Malachi Throne provided the voice (but not the face) for the Talosian Keeper in the unaired ''Trek'' pilot, "[[{{Recap/StarTrekS1E0TheCage}} The Cage]]". Almost two years later, Throne was cast as Commodore Mendez for "The Menagerie" two-parter, which recycles footage from first pilot. His voice for The Keeper had to be electronically altered so the audience wouldn't recognize it as the same guy.
* ActorAllusion: "[[{{Recap/StarTrekS3E6SpectreOfTheGun}} Spectre of the Gun]]" was Creator/DeForestKelley's third trip to the OK Corral; he played Morgan Earp in the 1957 film ''Gunfight At The O. K. Corral'', as well as Ike Clanton in the educational TV show ''You Are There''.
* ActorInspiredElement: Many elements of the Spock character were improvised by Creator/LeonardNimoy during production. For instance, the "Vulcan neck pinch" was his suggestion during filming of "[[{{Recap/StarTrekS1E5TheEnemyWithin}} The Enemy Within]]" for how Spock could subdue an opponent. The "Vulcan salute" was created during the production of "[[{{Recap/StarTrekS2E1AmokTime}} Amok Time]]" using a version of a traditional Jewish religious hand gesture as a distinctive Vulcan greeting.
* ActorSharedBackground:
** Both Creator/DeForestKelley and Bones are natives of Georgia and have Irish sounding names.
** Creator/JamesDoohan had a degree in Engineering and even used it to save Creator/GeneRoddenberry from danger when they went out boating and ran into trouble. No record exists of him saying that the boat "cannae take much more of this" though. [[note]] It came into play when someone asked about Scotty's {{Unishment}} in "[[{{Recap/StarTrekS2E15TheTroubleWithTribbles}} The Trouble with Tribbles]]" spending shore leave in his quarters with tech journals. The reply was "Scotty reads tech journals because ''James Doohan'' reads tech journals." [[/note]]
* BannedInChina:
** The first BBC broadcast of "[[{{Recap/StarTrekS1E8Miri}} Miri]]" led to protests over its allegedly over-horrific nature (since it involved children in peril and adults getting killed), and as a result it and three later episodes--"[[{{Recap/StarTrekS3E10PlatosStepchildren}} Plato's Stepchildren]]", "[[{{Recap/StarTrekS3E12TheEmpath}} The Empath]]" and "[[{{Recap/StarTrekS3E14WhomGodsDestroy}} Whom Gods Destroy]]"--were suppressed from BBC broadcasts of the show until the 1990s due to being considered excessively violent and horrific.
** "[[{{Recap/StarTrekS2E21PatternsOfForce}} Patterns of Force]]" was not aired on German TV before the 1990s, as the frequent use of Nazi imagery and claims of Nazism making for an efficient society meant it was (understandably, and as is quite common in the country) deemed unsuitable for entertainment in Germany. It finally made its public TV debut in 2011, though it had already been shown on German pay TV in 1996 and included in the DVD/blu-ray sets.
* {{Blooper}}: In "[[{{Recap/StarTrekS1E5TheEnemyWithin}} The Enemy Within]]", the scratches on Evil Kirk's face change side during his VillainousBreakdown near the end.
* BeamMeUpScotty: TropeNamer:
** Kirk's the TropeNamer, by omission. No, he never said it. (No, not even in ''WesternAnimation/StarTrekTheAnimatedSeries''--there he says "Beam ''us'' up, Scotty".) The closest he comes is in ''Film/StarTrekIVTheVoyageHome'' where he says, "Scotty, beam me up."
** Spock never said "It's life, Jim, but not as we know it"; that's from ''Star Trekkin'''. The closest he ever came in canon was the episode "[[{{Recap/StarTrekS1E25TheDevilInTheDark}} The Devil in the Dark]]":
-->'''Spock:''' Within range of our sensors, '''there is no life''', other than the accountable human residents of this colony beneath the surface. '''At least, no life as we know it'''.
** Scotty is universally remembered as complaining that the engines "cannae take much more ah this, Cap'n", for fear that "she's gonna blow", or some variation thereof. He's also known to protest that "ah doon have th' pow'r, Cap'n!" He never used ''any'' of those phrases on the show; they're cobbled together out of a dozen different lines from different episodes, and have become ubiquitous in parodies ever since.
** Scotty's also said "'''''Ah''''' cannae change the laws of physics", and ''not'' "'''''Ye''''' cannae". That's from ''Star Trekkin'''.
*** He didn't say either. He said, exactly, "I can't change the laws of physics. I've got to have thirty minutes!" Most parodies play the accent up far beyond the original.
*** He said "she'll blow soon" once, in "[[{{Recap/StarTrekS1E10TheCorbomiteManeuver}} The Corbomite Maneuver]]".
** Don't expect to ever hear Sulu say "''Oh, my''." That's Creator/GeorgeTakei's personal {{catchphrase}}. Sulu himself was the only regular who lacked a memorable CatchPhrase or VerbalTic, one of the reasons he didn't show up in too many parodies (and when he did, he was usually the StraightMan). More recently, given Takei's predilection for AdamWesting, parodies of Sulu are basically parodies of Takei (including the CampGay antics--see below).
* TheCastShowoff: Creator/NichelleNichols got to show off her singing ability a couple times, as did Creator/LeonardNimoy once (under the influence of aliens, since crooning would be out of character).
* CastTheExpert: Trained belly-dancer Tania Lemani appeared as the dancer Kara in "[[{{Recap/StarTrekS2E14WolfInTheFold}} Wolf in the Fold]]", and did her own choreography for the dance routine that occupies most of the character's screen time.
* CreatorBacklash:
** Creator/HarlanEllison's opinion of "[[{{Recap/StarTrekS1E28TheCityOnTheEdgeOfForever}} The City on the Edge of Forever]]" is in the Creator Backlash Hall Of Fame.
** Grace Lee Whitney had some choice words about the episode "[[{{Recap/StarTrekS1E5TheEnemyWithin}} The Enemy Within]]" later on:
--->'''Whitney:''' At the end of "The Enemy Within," there is a badly botched attempt at humor. In a poorly motivated and out of character moment, Mr. Spock needles me about my feelings towards the evil Kirk (who came to be called "the Imposter," even though he was supposedly every bit as much a part of the "real" James T. Kirk as the good Kirk). There is almost a nasty leer on Spock's face as he says to me, "The Imposter had some very interesting qualities, wouldn't you say, yeoman?" My response was to ignore the jibe. I can't imagine any more cruel and insensitive comment a man (or Vulcan) could make to a woman who has just been through a sexual assault! But then, some men really do think that women want to be raped. So the writer of the script (ostensibly Creator/RichardMatheson--although the line could have been added by Creator/GeneRoddenberry or an assistant scribe) gives us a leering Mr. Spock who suggests that Yeoman Rand enjoyed being raped and found the evil Kirk attractive!
** David Gerrold, whose first script for the series was only [[Recap/StarTrekS2E15TheTroubleWithTribbles one of the most loved episodes ever]], submitted an outline called "Castles In The Air." By the time [[Recap/StarTrekS2E16TheGamestersOfTriskelion Margaret Armen]] and [[Recap/StarTrekS3E15LetThatBeYourLastBattlefield Oliver Crawford]] were through with it[[note]]Armen has teleplay credit, Gerrold shares story credit with Crawford[[/note]] it became "[[{{Recap/StarTrekS3E21TheCloudMinders}} The Cloud Minders]]," and he wasn't happy with the finished product.
* CreatorsFavoriteEpisode: In a TV Guide interview two months before his death, Creator/GeneRoddenberry listed his ten favourite episodes - "[[{{Recap/StarTrekS2E1AmokTime}} Amok Time]]", "[[{{Recap/StarTrekS1E14BalanceOfTerror}} Balance of Terror]]", "[[{{Recap/StarTrekS1E28TheCityOnTheEdgeOfForever}} The City on the Edge of Forever]]", "[[{{Recap/StarTrekS1E25TheDevilInTheDark}} The Devil in the Dark]]", "[[{{Recap/StarTrekS1E5TheEnemyWithin}} The Enemy Within]]", "The Menagerie" (Two parter), "[[{{Recap/StarTrekS1E4TheNakedTime}} The Naked Time]]", "[[{{Recap/StarTrekS1E21TheReturnOfTheArchons}} The Return of the Archons]]", "[[{{Recap/StarTrekS1E3WhereNoManHasGoneBefore}} Where No Man Has Gone Before]]" and "[[{{Recap/StarTrekS2E15TheTroubleWithTribbles}} The Trouble with Tribbles]]"
** "[[{{Recap/StarTrekS1E25TheDevilInTheDark}} The Devil in the Dark]]" was Creator/WilliamShatner's favourite episode. He thought it was "exciting, thought-provoking and intelligent, it contained all of the ingredients that made up our very best ''Star Treks''." His father died during its filming, but Shatner insisted on going through with production, and felt closer to the cast and crew for helping him through the difficult time. "[[{{Recap/StarTrekS1E28TheCityOnTheEdgeOfForever}} The City on the Edge of Forever]]" was his second favourite.
** Creator/LeonardNimoy's favourite episodes were "[[{{Recap/StarTrekS1E24ThisSideOfParadise}} This Side of Paradise]]", "[[{{Recap/StarTrekS2E1AmokTime}} Amok Time]]", "[[{{Recap/StarTrekS1E28TheCityOnTheEdgeOfForever}} The City on the Edge of Forever]]", "[[{{Recap/StarTrekS1E4TheNakedTime}} The Naked Time]]", "[[{{Recap/StarTrekS2E10JourneyToBabel}} Journey to Babel]]" and "[[{{Recap/StarTrekS1E25TheDevilInTheDark}} The Devil in the Dark]]".
** Creator/DeforestKelley's favourite was "[[{{Recap/StarTrekS3E12TheEmpath}} The Empath]]".
** Creator/JamesDoohan's favourite was "[[{{Recap/StarTrekS2E6TheDoomsdayMachine}} The Doomsday Machine]]".
** Creator/GeorgeTakei's favourite was "[[{{Recap/StarTrekS1E4TheNakedTime}} The Naked Time]]".
** Creator/NichelleNichols' favourite was "Plato's Stepchildren". Her typical response to what her favourite was, "Anytime Uhura got off the bridge".
** Creator/WalterKoenig's favourite was "[[{{Recap/StarTrekS3E6SpectreOfTheGun}} Spectre of the Gun]]".
* CrossDressingVoices: The Talosians in "[[{{Recap/StarTrekS1E0TheCage}} The Cage]]"/"The Menagerie" are played by female actors but their voices are dubbed by male actors, most notably, Malachi Throne, who voices the lead Talosian.
* TheDanza:
** Gary Lockwood as Gary Mitchell in "[[{{Recap/StarTrekS1E3WhereNoManHasGoneBefore}} Where No Man Has Gone Before]]".
** Phillip Pine as Colonel Phillip Green in "[[{{Recap/StarTrekS3E22TheSavageCurtain}} The Savage Curtain]]".
** One of Adams' assistants in "The Dagger of the Mind" is named Eli. The actor playing him is named Eli Behar.
* DawsonCasting:
** Robert Walker was 26 years old when he played 17-year-old Charlie Evans in "[[{{Recap/StarTrekS1E2CharlieX}} Charlie X]]".
** Michael J. Pollard (27 years old) and Kim Darby (19) play pre-pubescent children in "[[{{Recap/StarTrekS1E8Miri}} Miri]]".
* EnforcedMethodActing:
** In "[[{{Recap/StarTrekS1E3WhereNoManHasGoneBefore}} Where No Man Has Gone Before]]", Gary Mitchell's GlowingEyesOfDoom were achieved by Gary Lockwood wearing silver contact lenses. Very primitives ones, with very small holes that he could only see through by raising his head and looking down his nose at everyone else, making his AGodAmI act more believable.
** In "[[{{Recap/StarTrekS2E15TheTroubleWithTribbles}} The Trouble with Tribbles]]", Creator/WilliamShatner was quite genuinely annoyed during the "Tribble waterfall" scene. The people throwing the Tribbles at him couldn't actually see what they were doing and kept it up long after it should have stopped.
* ExecutiveMeddling:
** Much is made of the show’s diversity, but rarely is it acknowledged that NBC wanted that diversity [[http://web.mit.edu/21l.432/www/readings/NBC_Chapt12.pdf more than Creator/GeneRoddenberry.]]
** The network chiefs felt the initial pilot episode, "[[{{Recap/StarTrekS1E0TheCage}} The Cage]]", was too cerebral for the average viewer at home, and turned it down on those grounds. [[NetworkToTheRescue They gave the series another chance]] though, on the proviso that Gene Roddenberry gave them something with a bit more action and a bit less philosophy--and less sex. The concept of an Earthman kept in an environment where any fantasy could be brought to vivid life--with a woman (and then ''two more'' women) who could assume any form he chose--was simply too much for network execs at that time.
** The original script for " [[{{Recap/StarTrekS1E27TheAlternativeFactor}} The Alternative Factor]]" had a subplot about a romance between Lazarus and Lieutenant Masters (Janet [=MacLachlan=]). It was cut when network heads objected due to the actress playing Masters being black.[[note]]NBC's policy was notoriously ''pro''-diversity in terms of casting, but interracial romances were a different matter--they worried that it would lose Southern affiliates.[[/note]] At the same time, John Drew Barrymore, originally set to play Lazarus, quit abruptly after script rewrites changed his character too drastically. The last-minute casting of Robert Brown and the hasty rewrites that followed were one cause of the uneven story we ended up with.
* FakeNationality:
** Creator/WilliamShatner and Creator/JamesDoohan (both Canadians) play an American and a Scotsman, respectively. Doohan initially tried to use an accurate Scottish accent as Scotty but [[RealityIsUnrealistic was told by execs it sounded fake]]. Creator/CraigFerguson vowed revenge on James Doohan as a teenager and would go on to play a [[IAmVeryBritish grossly-exaggerated Englishman]] on ''Series/TheDrewCareyShow'' just to spite ''Star Trek'' casting directors.
** Creator/WalterKoenig is a partial case: his parents were Russian Jews but Koenig himself was an American citizen playing the Russian Chekov.
** Creator/NichelleNichols (an American) played Uhura, whose native language is established as Swahili, implying Uhura is from somewhere in eastern Africa.
** Averted for Sulu, a Japanese-American from San Francisco, as is Creator/GeorgeTakei. Played straight in the 2009 {{film}}.[[note]] They were leery of casting an actor of non-Japanese descent until Takei himself assured them that it would be all right, claiming that the character represents all of Asia (note that Sulu is not a Japanese name). This paved the way for Korean-American John Cho to assume the role.[[/note]] In some of the non-canon novels, Sulu explains that his background ''is'' mixed, but primarily Filipino and Japanese.
** In the episode "[[{{Recap/StarTrekS1E22SpaceSeed}} Space Seed]]", Khan Noonien Singh is an Indian Sikh, played by Mexican actor Creator/RicardoMontalban.
* FanNickname: The (unnamed) alien in "[[{{Recap/StarTrekS1E1TheManTrap}} The Man Trap]]" is almost universally known as "the salt vampire".
* GeorgeLucasAlteredVersion: The 40th anniversary "Remastered" versions (also known as TOS-R), which (contentiously) replace the original practical effects (mostly involving ships, planets and [[AlienSky their skies]], and phasers) with CGI.
* HeyItsThatSound:
** The [[http://www.youtube.com/watch?v=gASm1AMYGHk transporter sound effect]] was based on [[http://www.youtube.com/watch?v=k0hs4KrkFp8#t=0m30s part of the "Tardis taking off" sound effect]] in ''Series/DoctorWho''.
** The [[https://www.youtube.com/watch?v=34FsrucOOBY sound effect for the photon torpedoes firing]] was taken from [[https://www.youtube.com/watch?v=QUY1KYEABz0 the green disintegrator rays]] in ''Film/TheWarOfTheWorlds''.
* LifeImitatesArt: This show inspired so many things...
** Possibly its ultimate triumph was that Creator/NichelleNichols's role on the show was the inspiration for Dr. Mae Jemison, ''America's first female African-American astronaut'', who later did a cameo on ''Series/StarTrekTheNextGeneration''.
** [[http://www.popfunk.com/wordpress/wp-content/uploads/2011/07/uhura029.jpg The earpiece worn by Uhura]] and sometimes by Spock may have been one of the inspirations for the Bluetooth headset.
** The show is often credited as the inspiration for Dr. Martin Cooper to invent the cell phone, but it also accurately predicted the tablet PC. Kirk is often shown using a stylus to sign a document on one, as we sign on electronic forms for credit card purchases today.
** The 3.5" one-megabyte computer disc looks like the small square tile discs used in the series.
** At the time the show was in production, the diagnostic panels over the beds and the "salt shaker" hand scanners used by [=McCoy=] were being developed and medical engineers were asking how the show's production designers had gotten hold of their plans. Today the diagnostic panels are commonplace.
** The military and many high-level police agencies are experimenting with non-lethal heat and sound beams to disperse riots and disarm attackers without killing them. Phasers on Stun, anyone?
** Automatically opening doors first came into common usage in the 1940s, but automatic ''sliding'' doors were still in development. The producers used to get mail from engineers demanding to know how they got their doors to open and close so fast. (They were operated by stagehands.) This lit the fire under more than a few engineers to perfect the automatic sliding door, which is commonplace today.
** The replicators used to make food have started to make their appearance as well; it is now possible to 3D print food.
* MagnumOpusDissonance: Although "[[{{Recap/StarTrekS2E6TheDoomsdayMachine}} The Doomsday Machine]]" usually places very highly in fan polls and best-of lists, certain members of the production staff were (and are) a good deal less enthused. Writer Norman Spinrad disliked the end result, complaining about the casting (he wanted Robert Ryan for Decker) and the underwhelming depiction of the planet killer (which he envisioned as having been "bristling with weapons"). In an interview for the Archive of American Television, story editor D.C. Fontana actually named it as her least favourite episode.
* McLeaned / RoleEndingMisdemeanor: There are conflicting reasons as to why Janice Rand was written out of the series after only eight appearances during the first season. Creator/GeneRoddenberry has said it was a budgetary move, but others have claimed that as the show progressed her role as the Captain's Woman, or potential loved interest for Kirk became impractical. Other stories have claimed that Grace Lee Whitney was having issues with alcoholism, which was said to be affecting her work on the series. Whitney herself said she may have been let go to keep her quiet over accusations of a network executive having sexually assaulting her.
* TheMerch: One of the rarest of the Mego action figures to come out in the '70s (and the only one tied to a specific episode) was of a Cheron from "[[{{Recap/StarTrekS3E15LetThatBeYourLastBattlefield}} Let That Be Your Last Battlefield]]".
* NamesTheSame: Writer Gene L. Coon got in a bit of trouble due to similarity of the episode "[[{{Recap/StarTrekS1E18Arena}} Arena]]" to a short story of the same name [[https://en.wikipedia.org/wiki/Cryptomnesia he had read and forgotten]]. The research agency spotted it immediately and contacted Creator/FredricBrown's agent, inviting him to "write something for Star Trek". After numerous improvements, Coon's work was sent to Brown, Brown okayed it and was given both money and screen credit.
* NoBudget:
** In order to cut costs, incidental music avoided scoring anything for violins. Melodies in the strings are played by violas. Violinists charge that much more, apparently.
** Also, [[StockFootage space and bridge scenes are recycled over and over]], and a few props and sets are recycled into later episodes.
** The running gag of Kirk's shirt tearing pretty much constantly was actually due to the fact that the shirts were of obscenely low quality because of the show's very low tailoring budget.
* TheOtherDarrin: Creator/WilliamShatner's predecessor, Jeffery Hunter, played Captain Pike in "[[{{Recap/StarTrekS1E0TheCage}} The Cage]]". This footage was later re-used in "The Menagerie", with Pike himself appearing a motionless deformity in an iron lung-type device. This was primarily to disguise the fact that Hunter was unavailable; this new Pike was played by a lookalike (such as he is) named Sean Kenney. What's interesting is that Captain Pike was retconned into Kirk's predecessor, as well; He was the original Captain of the ''Enterprise'', with Mr. Spock as his science officer. This is still canon in the Abrams film, in which Bruce Greenwood plays Pike.
* TheOtherMarty[=/=]ThePeteBest: Jeffrey Hunter's Captain Christopher Pike has gained something of a loyal following as being "the ''Star Trek'' captain who wasn't". Adventures featuring him have appeared in the expanded universe, in novels and in comic books; and he also made an reappearance in [[Film/StarTrek the 2009 reboot movie]], as played by Bruce Greenwood.
* PlayingAgainstType: Creator/DeForestKelley primarily played villain roles before TOS.
* RealitySubtext:
** Scotty's refusal to lower the shields against orders in "[[{{Recap/StarTrekS1E23ATasteOfArmageddon}} A Taste of Armageddon]]" is based on an actual story from Creator/JamesDoohan's military service.
** Any resemblance to the Vietnam War in "[[{{Recap/StarTrekS2E19APrivateLittleWar}} A Private Little War]]" is entirely deliberate.
** The [[AnAesop aesop]] about the destructive futility of racial hatred in "[[{{Recap/StarTrekS3E15LetThatBeYourLastBattlefield}} Let That Be Your Last Battlefield]]" came shortly after the assassination of UsefulNotes/MartinLutherKingJr
* RealLifeRelative: Many of the Onlies in "[[{{Recap/StarTrekS1E8Miri}} Miri]]" are children of various members of the cast and crew. The little girl Kirk picks up is played by Creator/WilliamShatner's daughter, Melanie Shatner.
* RecycledSet: The same backlot is used as 1930s New York in "[[{{Recap/StarTrekS1E28TheCityOnTheEdgeOfForever}} The City on the Edge of Forever]]", a Space Amish town in "[[{{Recap/StarTrekS1E21TheReturnOfTheArchons}} The Return of the Archons]]", and a planet that coincidentally looks exactly like 1960s Earth in "[[{{Recap/StarTrekS1E8Miri}} Miri]]". (It's actually the same backlot used as Mayberry in ''Series/TheAndyGriffithShow''; Kirk and Edith even walk past "Floyd's Barber Shop".)
* RedShirt: Although the TropeNamer, the first red-shirted casualty doesn't appear in series until episode 7 (" [[{{Recap/StarTrekS1E7WhatAreLittleGirlsMadeOf}} What Are Little Girls Made of?]]"); the very first casualties are blue-shirted Science Team and gold-shirted Command squaddies.
* ReferencedBy: Creator/BryanSinger is a {{Trekkie}}, so he included a couple of episodes in two ''[[Film/XMenFilmSeries X-Men]]'' films he directed. "[[{{Recap/StarTrekS1E4TheNakedTime}} The Naked Time]]" is seen on one of Hank's TV sets in ''Film/XMenDaysOfFuturePast'', and "[[{{Recap/StarTrekS2E2WhoMournsForAdonais}} Who Mourns for Adonais?]]" is playing in the background when Ororo has a private conversation with [[Film/XMenApocalypse Apocalypse]].
* RomanceOnTheSet: Creator/GeneRoddenberry was having extra-marital affairs with Creator/MajelBarrett and Creator/NichelleNichols. Nichols broke off her affair with Roddenberry not long after the series began, not wanting to be "the other woman to the other woman". Barrett would eventually marry the series creator. They remained together until his death.
* UsefulNotes/TheRuralPurge: Inverted--it should be noted that the demographic information that led to the Rural Purge wasn't available from Neilsen before 1970 or so; had it been, ''Trek'' would've benefited since it attracted advertisers' favoured demographics.
* ScienceMarchesOn:
** It's mentioned in "[[{{Recap/StarTrekS1E1TheManTrap}} The Man Trap]]" that buffalo are extinct. It is true that overhunting brought the buffalo very close to extinction at the end of the nineteenth century. In the 1960s, it was a fairly reasonable assumption that buffalo might be extinct in the future, although probably not the best guess since conservation efforts had started decades earlier. Today they are no longer considered endangered at all. (The episode also mentions passenger pigeons, which were already extinct when the episode was made.)
** In "[[{{Recap/StarTrekS1E19TomorrowIsYesterday}} Tomorrow Is Yesterday]]" the ship is thrown back in time by an encounter with a "black star". At the time, there was no widely-accepted term for a star which had collapsed into a singularity and had gravity so strong light could not escape, which we now call a "black hole". The term "black hole" was not generally accepted until later in 1967.
** In "[[{{Recap/StarTrekS2E3TheChangeling}} The Changeling]]", Kirk shows Nomad a map of the solar system with nine planets. This was before the upgrade of Ceres, the downgrade of Pluto and the discovery of Eres.
** In "[[{{Recap/StarTrekS2E6TheDoomsdayMachine}} The Doomsday Machine]]", the air pressure aboard the ''Constellation'' is measured in Pounds per Square Inch. kPa (kilopascal) is currently the preferred measure of pressure.
** In "[[{{Recap/StarTrekS2E15TheTroubleWithTribbles}} The Trouble with Tribbles]]", Bones uses the word "bisexual" for the concept which is now referred to as "hermaphroditic".
** In "[[{{Recap/StarTrekS2E18TheImmunitySyndrome}} The Immunity Syndrome]]", Spock reports the dimensions of the giant space amoeba in miles. Most scientists prefer the accuracy of the metric system and would use kilometers instead. Especially noticeable since kilometers were used earlier in the episode when reporting how far away the thing was.
** In "[[{{Recap/StarTrekS2E23TheOmegaGlory}} The Omega Glory]]", Captain Tracey thinks that the extended lifespan of the Omegans is due to a local disease, and hopes to isolate it and reproduce its benefits for other populations, but his hopes come to nothing after [=McCoy=] determines that the lifespan is the result of a genetic adaptation. Roddenberry didn't foresee that a genetic adaptation allowing for long life would today be just as identifiable, and perhaps in the future just as reproducible, as a serum.
** In "[[{{Recap/StarTrekS3E15LetThatBeYourLastBattlefield}} Let That Be Your Last Battlefield]]", Spock rightly points out that "evolution is man evolving from apes" is a grossly misleading and deliberate mischaracterization--but describes evolution as life forms [[EvolutionaryLevels evolving from "lower" to "advanced" stages]]. Now, evolution is understood as life forms changing over time to suit their environment. While they ''usually'' become more complex than their ancestors, they do sometimes become less complex if losing a trait 1. makes them more successful in their environment or 2. doesn't hurt them either way.
* ScullyBox: According to producers Herbert F. Solow and Robert H. Justman, Creator/WilliamShatner originally wore 1.5" lifts in his shoes so he would appear taller than Creator/LeonardNimoy. Since Shatner was only 5'9", the combination of lifts and the 2" heels of his shoes brought his height to over 6'. It distorted his posture to such a degree. his stomach stuck out. Understandably, Creator/GeneRoddenberry forbid him to wear them, instead opting to dress Nimoy and Creator/DeForestKelley in shoes with only a 1" heel as opposed to Shatner's 2" heel.
* SerendipityWritesThePlot:
** The transporter was created because it would be too expensive to have the crew land on the planets in a shuttle every episode.
** During production of "[[{{Recap/StarTrekS1E3WhereNoManHasGoneBefore}} Where No Man Has Gone Before]] ", Gary Lockwood found the silver contact lenses painful and difficult to see through. Gary Mitchell's imperious stare is a result of Lockwood having to look down his nose through the pinholes in the lenses.
* TechnologyMarchesOn:
** That big ass tape deck that Kirk uses to record his CaptainsLog on, as seen in "[[{{Recap/StarTrekS1E9DaggerOfTheMind}} Dagger of the Mind]]".
*** Said big ass tape deck is a [[http://en.memory-alpha.org/wiki/Tricorder tricorder]], the same one you see Spock walking around with on planets. It is essentially a handheld computer. Roddenberry originally developed it as a practical device but also as a marketable "toy for female-type children".
** "The Menagerie", in depicting Pike's condition, severely underestimated how far computer-assisted communication would come in just a few decades (think Stephen Hawking). However, it could be justified that Pike's nervous system was so profoundly damaged by the delta ray exposure that the single flashing light is all he can do with such injuries.
** In "[[{{Recap/StarTrekS1E13TheConscienceOfTheKing}} The Conscience of the King]]", Kodos faked his own death with a body "burned beyond recognition" and started again with a new identity. Since the episode first aired, several technologies have become commonplace (such as DNA matching) that would have made the question of identification less difficult for the heroes.
*** Unless of course the body was disfigured by chemicals or radiation that degraded the DNA making it unidentifiable.
** In "[[{{Recap/StarTrekS1E14BalanceOfTerror}} Balance of Terror]]", Spock removes a panel to reveal that some internal electronics have caught fire. (And then he puts the fire out with his hands. Love that Vulcan stoicism.) It seems unlikely that an interstellar spaceship wouldn't have an over current protection device that would prevent such a fire.
* ThrowItIn:
** The Vulcan mind-meld, neck pinch and salute are all examples of this. All were suggestions made by Creator/LeonardNimoy. In the case of the first two, they replaced more mundane, conventional ideas in the original scripts (respectively, a simple interrogation in "[[{{Recap/StarTrekS1E9DaggerOfTheMind}} Dagger of the Mind]]", and Spock slugging evil Kirk with a pistol butt in "The Enemy Within").
** In [[{{Recap/StarTrekS1E4TheNakedTime}} "The Naked Time]]", Uhura's response to being cast as the "fair maiden" in Sulu's swashbuckling fantasy ("Sorry, neither.") was an ad lib by Creator/NichelleNichols during rehearsals.
*** The entire scene in "Naked Time" where Spock struggles to remain in control of his emotions was suggested by Creator/LeonardNimoy. They only had time for one take, which was entirely improvised.
** According to legend, the stagehands didn't like Creator/WilliamShatner very much, so in the episode "[[{{Recap/StarTrekS2E15TheTroubleWithTribbles}} The Trouble with Tribbles]]", they continued the avalanche of tribbles much longer than was scripted (including the final tribble that bounces off his head at the end). Shatner can clearly be seen glancing up at the prop men with annoyance.
** "[[{{Recap/StarTrekS3E6SpectreOfTheGun}} Spectre of the Gun]]" was originally planned to be filmed on an existing Western town set on the backlot. However, serious budget cuts for the series' third season made this impossible. So, it was instead made on a soundstage in a surreal, incomplete, plainly artificial environment. Though some (including Creator/LeonardNimoy) were skeptical over this move, it's now largely viewed to have been a good choice for the story.
* TroubledProduction:
** Production was rife with problems. The root cause for much of it was the network wanting an action-oriented SpaceWestern and the production team wanting to do serious science fiction. Low budgets were also a big problem, something you'd [[SpecialEffectFailure probably figure out from watching almost any episode]]. Things got especially bad in the infamous Third (or "Turd") Season. The show was renewed thanks to a fan letter-writing campaign, but with budgets slashed further and a move to the FridayNightDeathSlot. This led to Creator/GeneRoddenberry quitting his job as ShowRunner. As a result of all this, the third season had a marked decline in quality with an accompanied increase in campiness. Creator/LeonardNimoy found himself frequently clashing with writers and directors who wanted Spock to do OutOfCharacter things like use violence or hit on the GirlOfTheWeek. By the end of that season, the show had predictably crashed and burned itself into {{Cancellation}}.
** If there's any single episode of TOS that suffered from this trope, it was "[[Recap/StarTrekS1E27TheAlternativeFactor The Alternative Factor]]" during the first season. John Drew Barrymore, John's son and Drew's father, had been cast as Lazarus, the main guest role ... and then didn't show up on the first day of filming. His agent and lawyer couldn't find him, so they cast [[LargeHam someone else]] in a big hurry (Barrymore's absence led to him getting suspended by SAG for six months after Desilu filed a grievance). The beard for the replacement was improvised from what had been designed for Barrymore, and it shows. The script has howler lines like "Starfleet has been getting reports from [[WritersHaveNoSenseOfScale all over the galaxy and far beyond]]..." It also had a subplot in which Lazarus became romantically involved with a black member of the crew -- which admittedly seems out of place on the eve of universal Armageddon and didn't have much to do with anything. That was actually filmed ... and hastily edited out when NBC got paranoid about how the Southern affiliates would react, resulting in the finished episode's choppy feel.
** "[[Recap/StarTrekS1E28TheCityOnTheEdgeOfForever The City on the Edge of Forever]]" may be a contender for the high point of the entire franchise, but it had a troubled time getting there:
*** Creator/HarlanEllison's first draft was agreed by just about everyone to be a masterpiece in its own right, but didn't really feel like a ''Star Trek'' episode, with Creator/GeneRoddenberry's chief complaint being the inclusion of a drug-dealing character who helps get the plot of the episode underway, along with Kirk having him executed via firing squad in the episode's climax. On top of that, Ellison added in an element of barely-suppressed racial undertension between Kirk and Spock, even though Kirk making such remarks had served as an instant OutOfCharacterAlert in "[[Recap/StarTrekS1E7WhatAreLittleGirlsMadeOf What Are Little Girls Made of?]]" earlier in that season.
*** The job of rewriting Ellison's script was given to script editor Steven W. Carabatsos, only for the resulting script to turn out so awful that it nearly resulted in Ellison quitting the project in fury, and played a major part in Carabatsos being let go from the series and replaced by D.C. Fontana shortly afterwards. Ellison then went back and did another rewrite himself, with input from producer Gene L. Coon, and despite deleting the racial elements and changing the drug dealer's demise to a KarmicDeath inflicted by the Guardian of Forever, Roddenberry still wasn't happy with it.
*** At this point, Fontana herself took a shot at the script, essentially starting over using Ellison's basic story outline as a start point. This time, everyone involved agreed that Fontana had absolutely nailed the story, with only a few small rewrites subsequently being done by Roddenberry and Coon, mostly to account for actor, set and prop availability.
*** Filming was comparatively more smooth, though the demands of the shoot meant they needed an extra two days to film everything. Production designer Matt Jefferies was also laid low with a flu virus in pre-production, resulting in his supervisor, Rolland M. Brooks having to design the Guardian of Forever.
*** Before the episode was broadcast, Roddenberry publicly badmouthed Ellison's work on the episode, which infuriated the writer and caused him to demand that he be credited under his pseudonym, "Cordwainer Bird." Since it was already widely known even in 1967 that he used this to flag works which had been wrecked by ExecutiveMeddling, and that this would [[TaintedByThePreview cause viewers to expect the episode to suck even before watching it]], Roddenberry used every means he could to drag out the Writer's Guild arbitration process until the episode was ready to air, and it was too late to do anything more about it. However, this also meant that Fontana, who should have been credited as co-writer, ended up having to go without credit.
** The effects for the show itself also proved no end of production issues with the crew:
*** The main company hired to do the series, Creator/TheHowardAndersonCompany, managed to do both pilots on a decent time scale. But when it came to the first ''actual'' episode produced ("[[Recap/StarTrekS1E10TheCorbomiteManeuver The Corbomite Maneuver]]"), their workload increased to the point where there was no choice but to hire other vendors to help out with the show.
*** One of these, effects veteran Linwood Dunn's Film Effects of Hollywood, would go on to produce most of the effects during the first and second seasons[[note]]and would be further joined by several other houses, namely The Westheimer Company, Van Der Veer Photo Effects and Creator/CinemaResearch[[/note]]. By the time season 2 started, Dunn and the studio were clearly not getting along with each other (The company worked on the series on an episodic basis), resulting in sub-par effects given to the supervisors and editors[[note]]in one instance, the company finished four composite shots of the Enterprise, but only sent them ''two'' due to their poor quality.[[/note]]. The company left the series by the time of season 3 due to budget cuts, but their involvement left a sour taste in everyone's mouths.
*** The 11-foot model of the Enterprise was, in fact, one of the reasons why Dunn's company was hired to begin with. As the ship proved too huge for both of the studios Anderson's crew to work with. Once Film Effects was dropped from the series, the model and its 3-foot counterpart were subsequently retired, with heavy use of StockFootage being used for the ship for the third season.
* {{Tuckerization}}: The slanting crawlway that leads up to the warp-drive nacelles is referred to as a "Jefferies tube." This is a reference to art director Walter M. Jefferies.
* TypeCasting: The show is infamous for doing this to its main cast for decades to come (Creator/WilliamShatner sort of overcame the problem some twenty years later).
* UnderminedByReality:
** Creator/GeneRoddenberry's vision of a future moneyless utopia falls rather flat when you learn that the man himself was a quite ruthless businessman, pulling shady moves like writing completely irrelevant lyrics to the show's theme song that were never intended to be used just so he could steal part of the composer's paycheck. Though you can still argue that the "idea" itself is more important than the flaws of the man behind it.
** Of course, the "moneyless society" concept was [[NewerThanTheyThink never part of the original series.]] The episodes with Harry Mudd and Cyrano Jones make it very clear that money ''does'' exist. The "we don't use money in the future" idea first appears decades later in a throwaway line in ''Film/StarTrekIVTheVoyageHome,'' and frankly seems to just come out of the blue. It would be ''Series/StarTrekTheNextGeneration'' that made it a central aspect of the setting.
* UrbanLegendOfZelda: Cyrano Jones is such a similar character to Harry Mudd that a story got started that he was written as Mudd, but changed when Roger C. Carmel was unavailable. In fact, the original script for "[[{{Recap/StarTrekS2E15TheTroubleWithTribbles}} The Trouble with Tribbles]]" does have the same character (though his last name is Smith).
* VindicatedByReruns: Possibly the TropeCodifier. It was a modest ratings success until Creator/{{NBC}} developed the habit of [[ScrewedByTheNetwork switching its timeslot around]]. The [[ExecutiveMeddling extensive rewriting of scripts]] and lack of immediate success made many of its more talented writers leave, which caused [[SeasonalRot the quality to slip noticeably in a short time]]. It was cancelled after the second season, but quickly UnCanceled following an extensive letter-writing campaign from its fans. The third season saw even worse ratings, and NBC cancelled it for real. Shortly afterwards, American television industry discovered the use of {{demographics}}. When stations noticed that, according to the new standards of how ratings were calculated, ''Star Trek'' should have been one of the most successful shows on TV (and that NBC had killed what could have been their golden goose), they were rushing to throw on ''Star Trek'' reruns to attract the young demographic that it had been popular with. It didn't take many years of reruns before the show's modest fanbase grew into a force to be reckoned with. The rest is history.
* WagTheDirector: The story is that Creator/WilliamShatner spent a lot of time taking lines away from other actors. Things worsened when the movies became popular. Think about it: Creator/NichelleNichols, who doesn't get a lot of work, gets maybe 12 lines in the whole movie. That's it, that's her acting job for this decade. Apparently, Shatner was always sidling up to directors and saying things like, "You know, this scene really doesn't make much sense. It would be so much more dramatic if you just went into tight close-up on ''me'', and then I could say the line, instead of Nichelle."
** When called out on it, his response was always the same: ''I was just trying to make the best, most dramatic movie, and that simply meant more of ''me''.'' His castmates could do nothing as their roles were whittled down to nothing. You could say that it was sour grapes, but consider this: Shatner has always said that he wasn't the only star of the show, that the show revolved around him and Nimoy. But none of the actors hate Nimoy. Because he didn't treat them like extras.
* WordOfGay: Inverted. Since Creator/GeorgeTakei has come out of the closet, many have speculated that Sulu is gay too, but Takei asserted that he had played Sulu as being straight. However:
** It didn't stop David Gerrold from inserting some cute dialogue in the fan-staged "Blood and Fire" which has a gay couple.
--->'''Alex:''' ''[hugs Pete from behind]'' Guess who?\\
'''Pete:''' Mr. Sulu.\\
'''Alex:''' You wish.
** It also led to a minor controversy over the Kelvin Timeline film ''Film/StarTrekBeyond'' when they decided to make their version of Sulu gay.
* YouLookFamiliar:
** Morgan Woodward guest-starred twice, as Dr. Simon Van Gelder in [[{{Recap/StarTrekS1E9DaggerOfTheMind}} Dagger of the Mind]]" and as Captain Ronald Tracey in "[[{{Recap/StarTrekS2E23TheOmegaGlory}} The Omega Glory]]".
** Bruce Mars featured as Finnegan the Irish bully in "[[{{Recap/StarTrekS1E15ShoreLeave}} Shore Leave]]" and also appeared as a New York officer in 1968 in "[[{{Recap/StarTrekS2E26AssignmentEarth}} Assignment: Earth]]".
** Craig Hundley appeared as Kirk's nephew Peter in "[[{{Recap/StarTrekS1E29OperationAnnihilate}} Operation: Annihilate!]]" before featuring as Tommy Starnes in "[[{{Recap/StarTrekS3E4AndTheChildrenShallLead}} And the Children Shall Lead]]".
** Diana Muldaur guest-starred twice, as Dr. Ann Mulhall in "[[{{Recap/StarTrekS2E20ReturnToTomorrow}} Return to Tomorrow]]" and as Miranda Jones in "[[{{Recap/StarTrekS3E5IsThereInTruthNoBeauty}} Is There in Truth No Beauty?]]". (And then she returned in ''TNG'', but that's beyond the scope of this page.)
** Mark Lenard first appears as the Romulan commander in "[[{{Recap/StarTrekS1E14BalanceOfTerror}} Balance of Terror]]", then as Spock's father Sarek. He then shows up as a Klingon in the prologue of [[Film/StarTrekTheMotionPicture the first movie]], thus appearing as a member of three of the major galactic powers of the era.]
** Skip Homeier played the main antagonist in both "[[{{Recap/StarTrekS2E21PatternsOfForce}} Patterns of Force]]" and "[[{{Recap/StarTrekS3E20TheWayToEden}} The Way to Eden]]".

!!This series is the TropeNamer for:

* AirVentPassageway
* BeamMeUpScotty
* BeardOfEvil
* BoldlyComing
* CaptainsLog
* FascinatingEyebrow
* All three components of the FreudianTrio:
** TheKirk
** TheSpock
** TheMcCoy
* GreenSkinnedSpaceBabe
* HesDeadJim
* ImADoctorNotAPlaceholder
* KirksRock
* KirkSummation
** ShutUpKirk
* MarySue: From ''Fanfic/ATrekkiesTale''.
* MirrorUniverse
* RedShirt
** MauveShirt
** RedShirtArmy
* ScottyTime
* SpaceWhaleAesop: From ''Film/StarTrekIVTheVoyageHome''.
* SpockSpeak
* StrawVulcan
* TheissTitillationTheory: Named for the show's costume designer, William Ware Theiss.
* VulcanHasNoMoon
* WagonTrainToTheStars
* WeComeInPeaceShootToKill: From "[[FilkSong Star Trekkin']]".
* WhereNoParodyHasGoneBefore: Shares its name with the title of the fourth season episode of ''{{WesternAnimation/Futurama}}'', whose plot was an homage to and an AffectionateParody of everything ''Franchise/StarTrek'', particularly the original series and its movies.

!! This series [[ImageSource provides the page image]] for:

* ChekovsGun
* CosmeticallyAdvancedPrequel (top half)
* TheEmpire
* EnergyBeings
* EverythingSensor
* EvolutionaryRetcon (left half)
* ExplosiveInstrumentation
* FreudianTrio
* HistoricalDomainCharacter (bottom-left)
* TheKirk
* TheMcCoy
* NoNewFashionsInTheFuture
* PlanetOfHats
* PressurePoint
* ProudScholarRaceGuy
* RedShirt
* RedShirtArmy
* SciFiWritersHaveNoSenseOfScale
* SocialSemiCircle
* TheSpock
* StrangeSalute
* TeleportersAndTransporters (fan-art)
* TeleporterAccident
* TheissTitillationTheory

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