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[[folder:''Men in Black'']]
* EnforcedMethodActing: TommyLeeJones was not amused by the script he was given, so he ad-libbed a good deal of his dialogue. Look closely enough and you can see WillSmith trying to keep up, as expected of the fresh recruit. The resulting synergy is well over half the movie's charm.
* HeyItsThatGuy
** The "Edgar-Bug" from the first movie is [[FullMetalJacket Gomer Pyle]]/[[Series/LawAndOrderCriminalIntent Detective Goren]], and Jeebs is {{Monk}}.
** [[Series/TheAddamsFamily Lurch]] is an alien?!
** Laurel's morgue attendant is [[Series/ArrestedDevelopment Tobias Fünke]].
** Zed is [[Film/{{Dodgeball}} Patches O'Houlihan]] but only in the movies.
* RecycledTheSeries
* ScienceMarchesOn: A minor one. When J heads to the morgue to retrieve a cat, he hilariously tries to convince Laurel that the cat is a witness in a murder investigation. Fast forward about ten years and advancements in forensic science mean that animals who 'witness' a murder can be checked for any forensic evidence the killer may have left behind.
* SimilarlyNamedWorks: There is another ''Men In Black'', which was a 1935 Film/TheThreeStooges short that was nominated for an Oscar.
* TechnologyMarchesOn: K shows J a small alien disc and says "They're going to replace [=CD=]s soon". At this point, it's doubtful. It was based on [[ProductPlacement Sony]]'s [=MiniDisc=], which did indeed fail to be the wave of the future. Also, J's introduction is him chasing down an alien on foot to arrest him. These days, the fleeing suspect probably would have been tazed, ending the chase rather quickly.
* ThrowItIn:
** The scene where the alien that Kay killed in the beginning of the film transformed was not originally planned. The creators added it in because they realized that most people would have sympathized with the alien had he died as is, and wanted to ensure no sympathy was to be gained for the alien prior to being killed.
** Will Smith's line "It just be rainin' black people in New York!" was improvised but so hilarious that they decided to leave it in.
** In fact, a lot of the lines in the original film were this. Creator/TommyLeeJones was famously dissatisfied with the script and so he took it upon himself to "fix" it by ad-libbing a good deal of his dialogue and one-liners, The result was Creator/WillSmith, not to be outdone, having to play along too. It was hilarious enough that Barry Sonnenfeld just didn't care and threw it ALL in. And the movie ended up being praised for its witty dialogue, in case you needed more proof how awesome Tommy Lee Jones is.
* WhatCouldHaveBeen
** Creator/BruceCampbell was the one originally in mind to play the exterminator, but he turned it down to appear in some TV movie that even some of his more hardcore fans haven't heard of.
** Creator/ClintEastwood was originally offered the part of Agent Kay, but declined.
** Among the options for the role of Jay was David Schwimmer of ''{{Friends}}'' fame. Imagine a Film/MenInBlack starring Creator/ClintEastwood and David Schwimmer.
** [[Film/BatmanForever Chris]] [[Film/BatmanAndRobin O'Donnell]] was the original choice for Jay. [[Series/NCISLosAngeles He does get another shot at being an agent, though.]] [[Film/BatmanForever So even after murdering his family, Two-Face still wants Robin to join the MIB?]]
** QuentinTarantino was originally the first choice for Director after the success of ''Film/ReservoirDogs.'' Tarantino turned down the offer, instead choosing to focus on the creation of ''Film/PulpFiction.''
** Originally, there were going to be ''two'' alien ships looming over the Earth, demanding the return of the galaxy: the Arquillian ship, and a Baltian ship (Rosenberg was originally a Baltian in the script). Edgar came to Earth to deliberately start a war between the two races, said to be negotiating peace, so he can feed off the resulting war. The initial volley is compared to two gunslingers using a giant rock as cover. Eventually, they decided the Baltians were not necessary to the plot, so some work was done in post-production (dubbing the aliens' conversation into "alienspeak", for one), and long story short, Rosenberg became an Arquillian.
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[[folder:''The Cartoon Series'']]
* HeyItsThatVoice:
** L in the first three seasons was played by [[Series/StarTrekVoyager Jennifer "Kes" Lien]].
*** And in season four, she was played by [[ThePowerpuffGirls Ms. Bellum]].
** K in the last three seasons was also [[TransformersGenerationOne Grimlock]] and [[{{Duckman}} Cornfed]].
** Frank the Pug was played by Eddie Barth, better known to audiences as [[SupermanTheAnimatedSeries Detective Bowman]].
** Season 2 saw the addition of Creator/GreggBerger as the voice of Agent K, voice of [[GarfieldAndFriends Orson Pig]].
** The villain Quintoon was played by René Auberjonois, better known as [[Series/StarTrekDeepSpaceNine Odo]].
** Kay's alien love interest Aileen is [[Series/SabrinaTheTeenageWitch Aunt Zelda]].
** [[Creator/DavidWarner Alpha]] is [[WesternAnimation/BatmanTheAnimatedSeries Ra's Al Ghul]], [[{{Freakazoid}} The Lobe]] and [[WesternAnimation/TheGrimAdventuresOfBillyAndMandy Nergal]], among others.
** Zed is [[WesternAnimation/TheCritic Duke Phillips]] and the Sheriff from {{Squidbillies}}, but only on TheAnimatedSeries.
** Buzzard is [[WesternAnimation/BatmanBeyond Blight]].
** Jeebs in the animated series is Creator/BillyWest, except for a few times that Tony Shaloub reprises the role.
* TheOtherDarrin:
** K's voice actor is replaced after the first season. L gets a new voice actress for the final season.
** Almost none of the actors from the movie reprised their roles for the show. [[{{Monk}} Tony Shalhoub]] did reprise Jeebs in a few early episodes, but Creator/BillyWest did the voice for the remainder of the series.
* SuspiciouslySimilarSong: The theme for the cartoon series carries the first few beats of Will Smith's eponymous "Men In Black" as part of its main theme, but ditches the rest of the song in favor of a instrumental hip-hop composition.
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