History Film / HotTubTimeMachine

* CoitusUninterruptus

* WeirdnessSearchRescue: The guy who fixes the hot tub and acts like he knows about time travel. However, he doesn't ''tell'' them about the time travel.

* AlmightyJanitor: Ok, Almighty Hot Tub Repairman.
* AnalogyBackfire:

* ArtisticLicenseHistory: Contrary to what the writers would have you believe, they had snowboards back in '86. Most ski resorts still didn't allow them, but being a ski patroller, Blaine could reasonably be expected to know what one is.
* AsideGlance: Nick, after the TitleDrop.
* BadFuture: Inverted, as the movie starts out in one.
* BasementDweller: Played straight as an arrow with Jacob.
* BiggusDickus: Nick.
* BloodyHilarious: [[spoiler: The bellhop ''[[OverlyLongGag finally]]'' losing his arm.]]
* CallingTheOldManOut: "I always knew there was a reason I hated you!"
* ChekhovsGunman: The squirrel Lou projectile vomits on later [[spoiler: changes the original outcome of a football game Lou bet on.]]
* ClusterFBomb
* CoitusUninterruptus
* DelayedRippleEffect: Jacob.
* DirtyCommunists: The time travelers are mistaken for these after Blaine and the ski patrol find their modern cell phones and [=MP3=] players (which they think are [[ShoePhone spy gadgets]]), and their can of Chernobly.
* TheEighties: Where our protagonists end up. Everything's so exaggerated, you can't tell whether for comedic purposes or because the characters are travelling back to their half-forgotten youth.
* ExactlyWhatItSaysOnTheTin: This movie is about a hot tub, which acts as a time machine.
* EyeScream: Averted with Adam, who was stabbed in the eye''brow''. Still, pretty close call.
* FightFurYourRightToParty: a guy in a bear suit suddenly appears during the BingeMontage.
* ForWantOfANail: Their very presence seems to have changed the outcome of an NFL playoff game.
* [[HeavyMetalUmlaut Heävy Mëtal Ümlaut]]: [[spoiler: Mötley Lüe, Lou's multi-platinum-selling band in which he rose to fame after [[IChooseToStay deciding to stay in the past]]]].
* TheFriendNobodyLikes: On Lou:

* HeroicBastard: Jacob[[spoiler:, at least until Lou (who, it turns out, is Jacob's father) changes the past so that he and Adam's sister get married.)]]
* HeyItsThatGuy: [[GrossePointeBlank Martin Blank]], [[TheOffice Darrel]], [[TheDailyShow that one dude from The Daily Show]] and [[KickAss one of Dave Lizewski's friends]] travel to the 1980s and run into [[Film/BackToTheFuture George McFly]], [[TheKarateKid Johnny Lawrence]], [[CloverField Marlena Diamond]] and [[NationalLampoonsChristmasVacation Clark Griswold]].

* HistoricalInJoke: The Red Bull-like Russian beverage "Chernobly" [[GreenRocks made the time machine work]] and brought the gang back to 1986 at the height of ski season, mere weeks prior to the Chernobyl incident.

* ItsNotYouItsMe: Played straight, both when Adam originally broke up with his girlfriend, [[spoiler:and again in the AlternateTimeline when ''she'' dumps ''him'', which she was gonna do anyway]].
* KnightTemplar: Blaine and his ski patrol friends. They have a legitimate mission of maintaining law and order on the mountain, but they use this and the [[DirtyCommunists Red Scare]] as an excuse to be [[{{Jerkass}} Jerkasses]].
* LeaningOnTheFourthWall: After Nick says, "[[TitleDrop It's some kind of hot tub-time machine]]".
* [[ALittleSomethingWeCallRockAndRoll A Little Something We Call Hip-Hop]] - After performing his cover of Rick Springfield's "Jesse's Girl", Nick gets a CrowningMomentOfAwesome and a CrowningMusicOfAwesome in one shot when he wows the audience with his rendition of [[spoiler: "Let's Get it Started" by {{Black Eyed Peas}}]]
* ManicPixieDreamGirl: April.
* TheMasochismTango: [[spoiler: Lou and Kelly]]. And loving it!
* MaybeMagicMaybeMundane: Is the CrypticConversation spouting repairman just a repairman and maybe a bit of a {{Cloud Cuckoo Lander}}, or is he some sort of TimePolice?

* MentalTimeTravel: For everyone but Jacob.
* MetalHead: Teenage Lou has long hair, a leather jacket, and an Music/IronMaiden t-shirt.
* MistakenForSpies: See DirtyCommunists.
* MisterSandmanSequence: When the four walk into the ski lodge. Leg warmers, [[RonaldReagan Reagan]], EightiesHair, ''MiamiVice'' T-shirts, cassette players, cell phones the size of bricks, {{MTV}} [[NetworkDecay playing music videos]], and more all set the mood.
* NarratingTheObvious: Lampshaded: "Do I really gotta be the asshole that says we got in this thing and went back in time?"

* NeverTrustATrailer: Nick's best line in the trailer, re: his fetish for ''TheGoldenGirls'', isn't in the movie.
* NoodleIncident: Cincinnati, and "Great white buffalo."

* NoOntologicalInertia: Played with with Jacob, who has perplexing ontological inertia.
* ObiWan: Parodied with the repairman.
* [[TheObiWannabe The Obi-Wannabe]]: The repairman delivers lots of [[IceCreamKoan cryptic and ominous-sounding warning]], from which the gang infers that doing anything differently will screw up the timeline in unpredictable ways. [[spoiler: They end up defying him, and it turns out to be 100% BS!]]
* OrangeBlueContrast: The whole movie has a deep teal and orange tint.
* PercussiveMaintenance: Jacob, when he starts going static.
* PlayingGertrude: Kelly and April in the future. Kelly especially because at they tried to make April look older.
* PrettyInMink: Being the 80s, and in ski country, several ladies of course wear some fur coats, including one woman wearing her fur jacket open, [[GoingFurASwim with a bikini top underneath]].
* RevivalByCommercialization: The song "Home Sweet Home" by MotleyCrue received a brief boost in popularity following the release of this film.
* RippleEffectProofMemory: [[spoiler: When the gang comes back to the future, they have no memory of Lougle or the success that they have enjoyed for the last few decades.]]
* RuleOfFunny: The overriding principle in the name of which all errors mentioned herein can easily be excused.
* RunningGag: The bellhop repeatedly failing to lose his arm in situations where he should have.

* ScrewDestiny
* SetRightWhatOnceWentWrong: [[spoiler: What the guys end up doing once they summon up the brass to defy the repairman and do things the way they wish they had. In the end it results in them all having much better lives than they did before]].
* [[SexDrugsAndRockAndRoll Sex, Drugs, and Rock 'n' Roll]]: Check, check, and check!
* ShoutOut: A very subtle one to ''HitchhikersGuideToTheGalaxy''. It's squirrels instead of mice, but there's clearly more than meets the eye going on with them.

* SpiritualSuccessor: From the TimeTravel, to the MisterSandmanSequence, to standing up to the bully and his toadies, to the [[ALittleSomethingWeCallRockAndRoll A Little Something We Call Hip-Hop]] scene, to the search for the AppliedPhlebotinum in order to get back, this is ''Film/BackToTheFuture'' for a new generation... or more like the same generation, but inverted.

* TimeTravelForFunAndProfit: Lou, big time. To a lesser extent, all the time travelers, although they were not aware until they came back.
* TimeyWimeyBall: The hot tub causes a MentalTimeTravel effect for Lou, Adam and Nick, but physically transports Jacob into the past.

* VomitIndiscretionShot: A particularly nasty one. For extra credit bonus points, it hits a squirrel.
* WhatYearIsThis = What color is MichaelJackson?
* WildMassGuessing: See the WMG/TimeLord category for details (one of the few of these that isn't incredibly contrived).

* SpiritualSuccessor: From the TimeTravel, to the MisterSandmanSequence, to standing up to the bully and his toadies, to the [[ALittleSomethingWeCallRockAndRoll A Little Something We Call Hip-Hop]] scene, to the search for the AppliedPhlebotinum in order to get back, this is ''BackToTheFuture'' for a new generation... or more like the same generation, but inverted.

* HeyItsThatGuy: [[GrossePointeBlank Martin Blank]], [[TheOffice Darrel]], [[TheDailyShow that one dude from The Daily Show]] and [[KickAss one of Dave Lizewski's friends]] travel to the 1980s and run into [[BackToTheFuture George McFly]], [[TheKarateKid Johnny Lawrence]], [[CloverField Marlena Diamond]] and [[NationalLampoonsChristmasVacation Clark Griswold]].

* PlayGertrude: Kelly and April in the future. Kelly especially because at they tried to make April look older.

* SetRightWhatOnceWentWrong: [[spoiler: What the guys end up doing once they summon up the brass to defy the repairman and do things the way they wish they had]].

* ArtisticLicens History: Contrary to what the writers would have you believe, they had snowboards back in '86. Most ski resorts still didn't allow them, but being a ski patroller, Blaine could reasonably be expected to know what one is.

* WhatYearIsThis? = What color is MichaelJackson?

* YouFailHistoryForever: Contrary to what the writers would have you believe, they had snowboards back in '86. Most ski resorts still didn't allow them, but being a ski patroller, Blaine could reasonably be expected to know what one is.

* RevivalByCommercialization: The song "HomeSweetHome" by MotleyCrue received a brief boost in popularity following the release of this film.

->''"It must be some kind of...[[TitleDrop hot tub time machine]] ." [[BreakTheFourthWall *stares intensely at viewers*]]''

* MetalHead: Teenage Lou has long hair, a leather jacket, and an IronMaiden t-shirt.

* TheEighties: Where our protagonists end up. Everything's so exaggerated, you can't tell [[YMMV whether for comedic purposes or because the characters are travelling back to their half-forgotten youth]].

* TheEighties: Where our protagonists end up.

* BigLippedAlligatorMoment: Jacob is running to find his companions. Suddenly he is dancing with a girl and asking if he can text her. The girl is never seen or mentioned again.

* ItsNotYouItsMe: Played straight, both when Adam originally broke up with his girlfriend, [[spoiler: and again in the AlternateTimeline when ''she'' dumps ''him'']].