!!The franchise in general
* AdaptationDisplacement: Most people are familiar with the series as either a five or six book "{{trilogy|Creep}}", unaware that it was first a radio program. To be absolutely clear:
** 1. It was a radio series...
** 2. That got adapted into a book series...
** 3. Which had a TV show made of it...
** 4. That had a text-based computer game made of it...
** 5. Which, many, many years later, had a movie made of it...
** 6. And we can only assume it will eventually be available in [[FoodPills pill form]] at some point.
** 7. Don't forget, there's already a towel.
* AngstWhatAngst: Trillian barely notices when her home planet is blown up and billions are killed. Dent has the decency to be shocked for a few minutes, though once he realizes that he can't quite wrap his head around the magnitude of the loss he starts going into shock.
** The film version of Trillian doesn't even find out until late in the story thanks to Zaphod. When she find out, she goes ''ballistic''.
--->'''Trillian:''' '''''Love and kisses?!?!'''''
* AwesomeEgo: Zaphod in all versions.
* CommonKnowledge: 42 is not "The Meaning of Life", it's "The Answer to the Ultimate Question of Life, the Universe and Everything." The reason it seems so random and nonsensical is because it's only an ''Answer'', and no one actually knows what the ''Question'' is.
* DiscreditedMeme: Like ''Film/MontyPythonAndTheHolyGrail'', the jokes in this franchise have been referenced to death.
** {{Wiki/Wikipedia}} is REALLY tired of people changing the entire article for Earth to say "Mostly Harmless".
* EarWorm: "[[RealSongThemeTune Journey of the Sorcerer]]". Every version with audio has got some arrangement of it.
** The 6" single of the TV theme music had a rather catchy song on the B-side called "Only The End Of The World Again", credited to Disaster Area.[[note]]According to [[http://h2g2.com/approved_entry/A32873899 h2g2]], Douglas Adams played guitar on it.[[/note]]
* EnsembleDarkhorse: Marvin is quite popular among the fans.
* HilariousInHindsight:
** ''{{Wiki/Wikipedia}}''. "While it has many errors and contains much that is apocryphal, or at least wildly inaccurate, it is slightly cheaper."
*** To say nothing of the fact that anyone could wander in and write a paragraph.
*** The Wikimedia project also has a travel guide.
*** Wikipedia's article on the series itself even mentions the Guide's similarities to Wikipedia.
** You can probably compare the shoddiness of the Sirius Cybernetics Corporation's products to your least favorite tech company.
** There's a throwaway line early in the series (books and radio) about Arthur wishing he had a daughter so he could forbid her to marry a Vogon. Towards the end of the series, [[BeCarefulWhatYouWishFor he ends up getting one, Random.]] [[BrickJoke Who he then forbids from marrying a Vogon.]]
** It's amazing how much the titular guide book resembles the Kindle.
* ItWasHisSled: 42 is the answer to the Ultimate Question of Life, the Universe and Everything.
* MemeticMutation:
** "42"
** "Zaphod's just this guy, you know?"
** "Ten out of ten for style [or X], but minus several million for good thinking, huh?"
* MisBlamed: Many people actually cry TheyChangedItNowItSucks to the various adaptation(s) because they're "not like the book". Adams ''wanted'' the various formats to diverge as soon as possible, and succeeded.
* SuspiciouslySimilarSong: To "Tunnel of Love" by Dire Straits, in the radio adaptation of [=SLaTfAtF=].
* TheWoobie: Arthur's the CosmicPlaything. Marvin's TheEeyore.
** [[http://www.youtube.com/watch?v=5ImiqaXBMkM This]] pretty much sums it up.

!!The radio series
* AdaptationDisplacement: Few people seem to realize the radio series predates the book.
* HilariousInHindsight: While the Shoe Event Horizon was funny back then, the rise of the Starbucks coffee chain means the world seems to be heading the same way in Real Life.
--> '''Student:''' Shoe shops have to sell more shoes, so they sell shoes so bad they either hurt the feet or fall apart. So people have to buy more shoes. Which means more shoe shops. Eventually it becomes economically impossible to build anything ''but'' shoe shops; the whole economy overbalances! Famine, collapse, and ruin!
** According to Adams it was heading that way at the time, which was why he wrote it; the name of the Galactic shoe conglomorate, Dolmansaxlil, is a WikiWord formed from thee of the chains owned by the British Shoe Corporation - Dolcis, Manfield, and Saxone, Lilley & Skinner, all of which had shops on Oxford Street and none of which - in Adams's opinion - had any decent shoes.
** Similarly, the joke about how humans are so primitive they think digital watches are neat was a jab at a fad of the time, which as all fads gradually died out (with cellular phones killing watches in particular). Then smart watches came along...
* SuspiciouslySimilarSong: The discotheque scene in the secondary phase - the background music is very obviously "[[{{Music/TheBeeGees}} Stayin' Alive]]" played in reverse.

!!The novels
The novels section has been divided into sections for your comfort and convenience.
* YMMV/LifeTheUniverseAndEverything
* YMMV/MostlyHarmless
* YMMV/AndAnotherThing

!!The TV series:
* FreezeFrameBonus: All over the place in the animations.
* RetroactiveRecognition: That's Creator/PeterDavison as The Dish of the Day. He was suggested by his then-wife Sandra Dickinson, who played Trillian.
* SpecialEffectsFailure: JustForFun/{{Egregious}}. The effects compare to some of the worst from ''Series/DoctorWho'', but the show's [[RuleOfFunny so funny]] you stop caring.
** The most JustForFun/{{egregious}} being Zaphod's second head, a mechanical prop which barely functioned and veered right into the UncannyValley. They tried to cover for it by his first head telling the second to "go back to sleep."
** May also qualify as NarmCharm.
* WTHCastingAgency: Trillian's accent. Seriously, what the Belgium was that all about? Made even stranger by the fact that she could do a perfectly passable English accent, as seen on a few outtakes. Apparently she asked Creator/DouglasAdams if he wanted an English accent, and he was so happy with her casting in the first place that he said no, she should use her normal voice. He came to regret this, in part because he realised it wasn't a particularly flattering thing to say to an actress.

!!The computer game:
* SoBadItsGood: The eighth or ninth time you die, you'd swear this was the most terrible game you've ever played. By the fifty-eighth or fifty-ninth time, [[GottaCatchEmAll you're playing to see how else you'll die.]] Winning is almost a letdown.

!!The movie:
* CrowningMusicOfAwesome: [[http://www.youtube.com/watch?v=xN9GCCwuxHQ "Finale"]].
* DeathOfTheAuthor: Many people who are critical of the RomanticPlotTumor are surprised to find that it was in Douglas Adams' pre-mortem draft of the script and that he is not, in fact, rolling in his grave over it. Upon a little more thought, most of them conclude that that doesn't make it any better.
* EarWorm: "So long and thanks for all the fish, so sad that it had come to this, we tried to warn you all but oh dear..."
* EnsembleDarkhorse:
** Marvin, due to the wonderfully deadpan way Creator/AlanRickman does the voice.
** Slartibartfast, thanks to Bill Nighy's performance.
* HilariousInHindsight: The team appearing as [[VideoGame/LittleBigPlanet knitted figures]] before achieving normality, seeing as Creator/StephenFry is the guide to both universes...
** Also, Humma Kavula's vicious "Don't Vote for Stupid" campaign against Zaphod Beeblebrox. [[https://www.vice.com/en_us/article/ywgxqb/america-is-being-run-by-zaphod-beeblebrox Hello]], President Creator/DonaldTrump...
* InternetBackdraft: When it was first announced that Mos Def would play Ford Prefect, there was a lot of racist comments made about him. Most of it [[AbilityOverAppearance subsided by the time the film came out]].
* MisBlamed: Many things the fans complained about were Adams' intention from when he first outlined this adaptation - fans should remember that he tried to work in new bits into every new ''Hitchhiker's'' adaptation - and much of the script was written by him.
* OlderThanTheyThink: Some people think that the movie ripped off the name "Babel Fish" from the now-defunct translation website, completely forgetting of course, that it is in fact the other way round considering the source material. The name itself, meanwhile, is in turn based on [[Literature/TheBible the biblical story of the "Tower of Babel"]].
* OneSceneWonder: Humma Kavula. Whether you approve of his addition to the story or not, there's no denying that Creator/JohnMalkovich (with the help of the special effects team) makes him a memorable character.
* RomanticPlotTumor: This very movie features a fairly obvious example of this trope, between Arthur and Trillian. The "original" source materials (book, TV and radio series) all handled their past differently, but agreed that Arthur had been briefly interested in Trillian during a single superficial encounter in the past; when he re-encounters her during the story, he displays jealousy at a few points, but not much more than that. By comparison, the movie version features an Arthur who is desperately pining over Trillian, who could have been his one true love had he not been afraid to pursue her, and he spends most of the movie time thinking about, worrying about or focusing on her. This was deliberately inserted by Douglas Adams when drafting the movie, before his death, to increase studio interest and audience acceptance of the movie.
** Actually, he tried to work it into the television adaptation, but the chemistry wasn't there between the actors.
%%* TheyChangedItNowItSucks
* WTHCastingAgency: Music/MosDef as Ford Prefect. [[SarcasmMode Oh, yes we totally buy that he's from Guilford]].
** Which is kind of the joke. Ford Prefect's half-arsed attempts to blend in and the total failure of British humanity to notice anything incongruous about him has always been a part of Ford's story (just look at his name) and one the movie merely played up a bit more.