!!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!
* SuspiciouslySimilarSong: The discotheque scene in the secondary phase - the background music is very obviously "[[{{Music/TheBeeGees}} Stayin' Alive]]" played in reverse.
* TearJerker: At the end of the Quandary Phase when [[spoiler: Fenchurch disappears during the hyperspace jump]].

!!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.
* SpecialEffectsFailure: {{Egregious}}. The effects compare to some of the worst from ''Series/DoctorWho'', but the show's [[RuleOfFunny so damn funny]] you stop caring.
** The most {{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."
* 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:
* BlatantLies: Ford's claim to be from Guildford becomes this since he's got an American accent, unless one is supposed to believe he means he's from America via Guildford.
** That argument only works if you're British and you're thinking of Guildford, near London. This film was made for Americans, who will think first of Guildford, Connecticut (just down the road from New London CT, oddly enough). A black American from Guildford is perfectly feasible - so long as the Guildford is in New England.
** There is also a Guildford in Vermont and a Guilford County and town in North Carolina. So lots of places for an American-accented Ford Prefect to come from. Only... the American version might have renamed him "Ford Edsel" or something, as the Prefect was only ever sold in Britain?
** The accent is remarked upon, though, as if he'd claimed to be from Guilford in England, since there's a line to the effect of "So you're not from Guilford, well that would explain the accent"
* CrowningMusicOfAwesome: [[http://www.youtube.com/watch?v=xN9GCCwuxHQ "Finale"]].
* DenserAndWackier: A lot of the fundamental elements of the first book make it in, but are crowded together to make room for a largely original second act. New arrivals to the franchise may find some scenes sheer ''randomness'' - for instance, the Vogon Poetry session has lost all foreshadowing and explanation.
* 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: Slartibartfast, thanks to Bill Nighy's performance.
* FreudWasRight: Questular instantly dislikes Trillian.
-->'''Questular:''' She's lying. She's skinny, and she's pretty, and she's lying!
* [[TheyChangedItNowItSucks He Changed It Again But It Sucks This Time]]
* HilariousInHindsight: The team appearing as [[LittleBigPlanet knitted figures]] before achieving normality, seeing as StephenFry is the guide to both universes...
* LoveItOrHateIt
* 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.
* MostWonderfulSound: Who else is now just reading the book in Stephen Fry's voice?
** [[http://www.audible.com/pd/Sci-Fi-Fantasy/The-Hitchhikers-Guide-to-the-Galaxy-Audiobook/B002VA9SWS Now available for the enjoyment of all.]]
* 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 John Malkovich (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.

!!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 [[FutureFood pill form]] at some point.
* 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 Great 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.
* ContinuitySnarl: Adams deliberately ensured that no two forms of the franchise were the same, with the exception of Arthur and Ford fleeing the Earth in Fit/Chapter/Part One. In a sense, Adams was {{Troll}}ing his own fans... or at least making sure everybody remembered the MST3KMantra. Which would you rather do, bicker over fictional minutia or have a good laugh?
* DiscreditedMeme: Like ''Film/MontyPythonAndTheHolyGrail'', the jokes in this franchise have been referenced to death.
* EarWorm: "[[RealSongThemeTune Journey of the Sorcerer]]". Every version with audio has got some arrangement of it.
* EnsembleDarkhorse: Marvin is quite popular among the fans.
* HilariousInHindsight:
** ''[[TheOtherWiki 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.
*** Huh. [[TVTropes I thought we]] [[DrPediaAndMrTrope were talking about]] [[RetconningTheWiki ourselves here.]]
** 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.]]
* ItWasHisSled: 42 is the answer to the Ultimate Question of Life, the Universe and Everything.
* LawfulNeutral: The Vogons.
* MemeticMutation: "42", "Zaphod's just this guy, you know?", "DON'T PANIC"...
* MemeticSexGod: Zaphod was once described by Eccentrica Gallumbits, the triple-breasted whore of Eroticon Six as "the best bang since the big one."
** Eccentrica Gallumbits herself is an invocation of the trope.
* MisBlamed: Many people actually cry AdaptationDecay or 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=].
** The theme on the TV series and record albums is a BBC-re-orchestrated edition of the Eagles' "Journey Of The Sorceror."
* TearJerker: [[spoiler: Marvin's death. He's finally happy, for the first time in his entire life (which in case you forget, is eight times older than the universe), and now he's dead. Maybe that's why he's happy.]]
** [[spoiler:And then in the radio version of ''Mostly Harmless''... he's been brought back to life because his warranty hadn't run out. And is miserable again.]]
** The song "Marvin, I Love You", released by Stephen Moore in-character as Marvin, details a surprisingly touching story about Marvin discovering an old tape in his databank, recorded by some sort of A.I. who is programmed to be in love with him ("Remember, I'm programmed for you/I know we're worlds apart/Still you could break my heart"). Marvin doesn't comprehend these words or know where they came from, but he apparently keeps the tape and can play it whenever he wants.
* TheWoobie: Arthur's the CosmicPlaything. Marvin's TheEeyore.
** [[http://www.youtube.com/watch?v=5ImiqaXBMkM This]] pretty much sums it up.
* ZeroContextExample: The number 42 is an in-universe use of the trope.