* ActorAllusion:
** A fake passport for Nina Myers in Season 3 is under the name "Sarah Berkeley" -- Sarah Clarke's married name (she married fellow cast member Xander Berkeley, who played George Mason).
** A subtle one is when Jack bites into a terrorist's neck, using his teeth. [[LostBoys Gee, when was the last time he could do something like that?]]
** [[spoiler: Paul [=McCrane's=] characters tend to die painful onscreen deaths. Guess what happens to Graem Bauer?]]
** Trip's wife is carrying twins, and they're kicking. She's lucky it's not [[{{Pun}} triplets]].
** The final two episodes of Season 8 are pretty much one giant one for Kiefer Sutherland's role in ''Film/PhoneBooth''. [[spoiler: Much like the Caller, Jack is smugly trailing a sniper rifle over a character while giving him directions over the phone.]]
** The first episode of Season 9 isn't the first time this year Kiefer Sutherland has had to [[spoiler:infiltrate a CIA black site to rescue a female former ally from imprisonment and torture]], as anyone who's played [[VideoGame/MetalGearSolidVThePhantomPain Metal Gear Solid V: Ground Zeroes]] will know.
** Anyone who watches Series/GameOfThrones knows that Michelle Fairley isn't unfamiliar with [[spoiler:one of her sons being [[DestinationDefenestration thrown out the window]].]]
*** Not to mention, [[spoiler:watching her son die just before she does.]]
* AuthorAppeal:
** Creator Joel Surnow is a major contributor to conservative causes and political candidates, and the show definitely represents a conservative, ends-justify-the-means worldview. Having said that, it depicts liberals, from President David Palmer (the only character explicitly identified as a Democrat) to Senator Blaine Mayer, as reasonable and sympathetic characters who (usually) don't stray into [[StrawCharacter Strawman Political]] or AuthorTract territory.
*** Though it does become an issue in ''Live Another Day'', as it seems like a large part of why the show was brought back was to make a NoCelebritiesWereHarmed strawman of Julian Assange who actively helps terrorists.
** The number of former ''Franchise/StarTrek'' (particularly ''[[Series/StarTrekEnterprise Enterprise]]'') actors who appeared on the show dramatically increased since Brannon Braga and Manny Coto joined on as executive producers. Creator/PeterWeller in particular has appeared in four Coto-produced shows (''Series/OdysseyFive'', ''[[Series/StarTrekEnterprise Enterprise]]'', ''24'', and ''Series/{{Dexter}}'').
** Tony Almeida is frequently seen drinking out of a Chicago Cubs mug because the actor, Carlos Bernard, is a huge fan of the team.
* DevelopmentGag: The wedding side story in season 2 was a nod to the original concept that 24 be a comedy about preparing for a wedding.
* DevelopmentHell: A feature film adaptation of the series has been in the works for years.
* ExecutiveMeddling: The reason Keeler survives the crash and subsequently disappears was thanks to a network mandate that the writers couldn't kill off a sitting President, as was originally intended in the Air Force One attack.
* [[Front13Back9 Front 13 Back 11]]: Bauer's wife and daughter were rescued in the 13th Hour of Day 1 as a precaution against the series being CutShort. The final scene in that episode where [[SortingAlgorithmOfEvil a second assassin]] was dispatched to kill Senator Palmer could have been cut cleanly.
* FakeAmerican: Creator/KieferSutherland is Canadian.
** In "Live Another Day", Australian Yvonne Strahvohski and Briton Colin Salmon play Americans.
* FakeNationality: Many, many, MANY instances.
** American Creator/DennisHopper as Serbian Victor Drazen.
** British Julian Sands as Russian separatist Vladimir Bierko.
** German Jürgen Prochnow as Russian Sergei Bazhaev.
** Northern Irish Michelle Fairley as English Margot Al-Harazi.
** And a short list of Middle Eastern examples:
*** Syed Ali was played by Mexican/Italian-descended Francesco Quinn.
*** Navi Araz was played by Hispanic Nestor Serrano.
*** Habib Marwan was played by Afrikaner Arnold Vosloo.
*** Abu Fayed was played by Greek-descended Adoni Maropis.
*** Omar Hassan was played by Indian Anil Kapoor.
*** Nadia Yassir was played by Mexican/Romanian Marisol Nichols.
* FanNickname: In season 8, Jack himself was given the nickname, "[[Franchise/StarWars Darth]] [[http://farm4.static.flickr.com/3408/4620102799_589bb375ab.jpg Bauer]]". Interestingly, when one would call him this nickname, he can be considered as the Darth Vader to Kim's Princess Leia.
** Curtis Manning was called "Black Bauer" or "Black-Jack" for effectively being just as badass as Jack, and for being... well, black.
** Fans of Larry Moss in Season 7 affectionately referred to him as "Boss Moss".
** The bag of equipment Jack can sometimes be seen toting was known as his "Jack-pack."
** ''Website/TelevisionWithoutPity'' had a cottage industry of these for ''24'', at least in the first few seasons worth of recaps. Some of the more notable ones include "Bitchelle" for Michelle Dessler, "Soul Patch" for Tony Almeida, "Spawn of Kiefer" for Kim Bauer, and "Im-ho-Terror" for Marwan...
** "Sparky" for Paul Raines, after Jack used electricity to torture him. There's also the far-from-creative "Agent Hobbit" for the season five character played by Sean Astin...
** FastKarateForTheGentleman makes a habit of creating dozens of these, for pretty much every character not in the core cast. Special mention goes to Special Agent Babykins, Chloe's son JibJub, and the President of Not-Iran.
%% A lot of these examples are commented out because they don't actually mention who is playing what, and sometimes not even who it is that is being referred to. Please make it clearer before uncommenting any of the below examples.
* HeyItsThatGuy:
** [[Series/{{Heroes}} Sylar]] used to work for CTU, and one of his bosses was [[Series/TheSopranos Father Intintola]].
** Habib Marwan is played by [[Film/TheMummyTrilogy Imhotep]].
** [[Series/StarTrekDeepSpaceNine Doctor Bashir]] shows up as reformed terrorist Hamri Al-Assad in Day 6.
** [[Film/HaroldAndKumarGoToWhiteCastle Kumar]] plays Ahmed Amar in Day 6.
** Jack's dad, Phillip, is [[Film/{{Babe}} Farmer Hoggett]] / [[Film/StarTrekFirstContact Zephram Cochrane]].)
** In Day 2, Marie Warner is played by [[Series/DeadLikeMe Daisy, Daisy Adair]].
** Season 7 piles on the ''Franchise/StarTrek'' (which fits, with former franchise heads Brannon Braga and Manny Coto on the production team):
*** Benjamin Juma is [[Series/StarTrekTheNextGeneration Worf's brother]].
*** Michael Latham is [[Series/StarTrekEnterprise Dr. Phlox]].
*** Port supervisor Carl Gadsen is [[Series/StarTrekEnterprise Trip Tucker]].
*** Blaine Mayer used to be [[Film/StarTrekVITheUndiscoveredCountry the President of the Federation]] before coming a Senator.
** In Season 8, CTU went pilot crazy and employed [[Film/WingCommander Christopher Blair]] and [[Series/BattlestarGalacticaReimagined Kara Thrace]] (as Cole Ortiz and Dana Walsh). And then to keep them on their toes, [[Film/WingCommander Commander Paul Gerald]] and [[Series/BattlestarGalacticaReimagined Leoben Conoy]] were thrown into the mix as bad guys (Sergei Bazhaev and Vladimir Laitanan).
*** Along with [[Series/{{Alias}} Mr. Sark]] as Josef Bazhaev.
** In Day 3, Wayne Palmer's girlfriend is [[Series/{{Firefly}} Zoe]].
** And for season 6 [[Film/LordOfTheRings Lord Denethor]] was working in the Russian government as an inside man for the terrorists, showing that he can be a bastard even without Sauron's corruption. Or maybe it was [[Series/{{Fringe}} Walternate]] all along.
** Also in season 6 [[Series/StargateSG1 Daniel Jackson]] is spying for Russians!
%%** [[Manga/FullmetalAlchemist Scar]] is an assassin who gets run over by a bulldozer driven by Jack in season 7.
** [[SpaceAboveandBeyond Col. McQueen]] is Bill Buchanan, head of CTU and seemingly the only boss Jack ever had that was GenreSavvy enough to be on his side.
** [[Series/{{Lost}} Desmond]] played German agent Theo Stoller in Season 5? ''Desmond?'' [[NotEvenBotheringWithTheAccent Coulda fooled me.]]
** [[Series/{{Lost}} Jin]] was CTU Agent Tom Baker for two seasons.
** And [[Series/{{Lost}} Dr. Chang]] left the DHARMA Initiative and was working as the Chinese consul in LA.
** Season 5 villain Collette Stenger was [[Series/{{Castle}} Kate Beckett]]. It is unlikely Castle will write a book about it...
** [[TelevisionWithoutPity Dr. Romano]] is Jack's brother, [[Film/TheLordOfTheRings Samwise Gamgee]] sacrificed himself for CTU and [[Series/AllyMcbeal John Cage]] got hurt tripping over [[Series/CriminalMinds Erin Strauss']] ineptitude.
** [[Series/TheUnit Jonas Blaine]] was the President. [[Series/StarTrekTheNextGeneration Ensign Ro Laren]] was his aide and [[Series/StarTrekDeepSpaceNine Kasidy Yates]] was his wife. [[Series/BuffyTheVampireSlayer Robin Wood]] was his brother.
** [[Series/{{House}} Dr. Kutner]] the professional defibrillist is a terrorist?.
** [[Film/SlumdogMillionaire India's Regis Philbin]] went into politics, and got elected President of the [[{{Qurac}} Islamic Republic of Kamistan]][[note]]He's Jack Bauer in another show now[[/note]].
%%** [[Series/StargateSG1 Daniel Jackson]] started sleeping with a White House aide to steal info for the Russians? Also, one of Ba'al's clones turns up as a sniper in Season 8. Jack does SG-1 a solid and caps him.
** In season 5, Jack briefly dated [[Series/FridayNightLights Tami Taylor]] / [[Series/AmericanHorrorStoryMurderHouse Vivian Harmon]] / [[Series/{{Nashville}} Rayna Jaymes]].
** Obviously [[Film/EasyRider Dennis Hopper]] as Drazen in season one. And his murderous sons? They're [[Series/{{Heroes}} Danko the Hunter]] and [[Series/{{Supernatural}} the angel Castiel]]. Lou Diamond Phillips is Drazen's jailer. ''Film/YoungGuns'' reunion!
%%** [[Series/StargateAtlantis Dr. Carson Beckett]] does evil deeds for Tony Almeida.
%%** Give [[Series/StormOfTheCentury First Gentleman Henry Taylor]] what he wants, and he'll go away.
** Gen. Juma in season 7 is Tony "{{Candyman}}" Todd.
%%** In Season 8, [[Series/TheWire Herc]] plays a cop who engages in police brutality. Big surprise.
%%** [[Film/{{Saw}} Jigsaw]] is a corrupt oil baron. ''I want to play a game!'' Indeed. Dessler's brother is Art from part 4.
** After Renee's crack-up, she's interrogated by an official from the Justice Department named... [[VideoGame/HalfLife2 Alyx Vance]]??
** [[Film/ForrestGump Bubba Blue's]] the head of CTU New York!
%%** And [[CanadaEh Canadians]] will notice [[Series/ThisHourHas22Minutes Raj Binder]] is a terrorist. To non-Canadians, he's [[Film/HaroldAndKumarGoToWhiteCastle Kumar's]] brother.
** So what does Franchise/{{Robocop}} do in his spare time? Oh, become Jack's mentor, Christopher Henderson, and [[spoiler:tries to kill him multiple times. But even he falls prey to Jack Bauer's prowess. Next up, Chuck Norris.]]
%%** Four episodes left in the series, and the audience is still asking if [[Film/OfficeSpace Milton]] is still stuck in the wall.
** In the later episodes of Season 8, Jack has to enlist the help of [[Series/MichaelMadsen Mr.]] [[Film/ReservoirDogs Blonde.]]
** [[Series/StargateUniverse Colonel Young]] is Michelle Dessler's brother. (Funnily enough, Reiko Aylesworth turns up in [[Series/StargateUniverse SGU]] in return.)
** When [[Series/{{Heroes}} D. L. Hawkins]] is forced to play RussianRoulette with Jack, he chooses not to phase the bullet through his head.
** [[TheTudors Thomas Cromwell]] used to be married to [[GreysAnatomy Teddy Altman]] and [[GossipGirl Blair Waldorf]] dated teenaged terrorist Behrooz - until his mother killed her. XOXO...
** Said poisoner of Manhattan's elite just so happens to be [[VideoGame/MassEffect2 Admiral Shala'Raan vas Tonbay, commander of the quarian Patrol Fleet]].
** [[Film/{{Gladiator}} Quintus]] works for [=McLennen=]-Forster.
** [[TheJourneyOfAllenStrange Allen Strange]] is Dubaku's son.
** [[Series/DeadLikeMe Daisy]] is getting married in day 2. And she's a Patty Hearst wanna-be.
** [[Series/AllyMcBeal John Cage]] is Pres. Palmer's (the other one) chief of staff.
** [[Series/{{Entourage}} Drama]] is a mountain man who saves Kim from [[TrappedByMountainLions those damn mountain lions]].
** [[Film/ConAir Cindino]] is TheMole from season 3. [[spoiler:[[ReverseMole Or Is he?]]]]
** Wait a minute... did Jack just knock out Air Marshall [[Series/{{Fringe}} Charlie Francis]]?
** Kristi from the ''Series/ParanormalActivity'' movies is Allison Taylor's daughter.
** ''Series/MysteryScienceTheater3000'' fans might recognize Walt Cummings as [[Film/DeathstalkerAndTheWarriorsFromHell Deathstalker]].
** Logan's partner in the final season was previously the head of security at the ''Series/{{Dollhouse}}''.
** Col. Dubaku was previously [[Film/PiratesOfTheCaribbean Gentlemen Jocard]].
** [[{{Roseanne}} Darlene Conner]] moved from Illonois to L.A. and got a job as an analyst at CTU [[spoiler: and then ultimately gave her life to help stop a bomb threat.]]
** If the comics are any indication, then Chase Edmunds will have left CTU to torment [[Film/IronMan3 Tony Stark]].
** Painting really doesn't pay, because why else would Creator/VincentVanGogh from ''Series/DoctorWho'' be palling around with the Russian mafia?
** [[Creator/AlexanderSiddig Ibhn Khaldoun]]! Didn't you already die trying to stop Muslim extremists [[{{Spooks}} five years ago]]?
** Wayne Palmer's Veep [[Film/RedDawn1984 already went to war against the Russians once]].
** Season 5 turns into a veritable ''Film/RoboCop1987'' reunion. Not only is the titular man himself there, he's also greeted by [[Creator/RayWise Leon Nash]] and [[Creator/PaulMcCrane Emil]].
** [[Series/OnceUponATime Regina/TheEvilQueen]] was a data analyst who got fired by Michelle while [[Series/OnceUponATime Mr. Gold/Rumplestiltskin]] is an old friend of Jack's.
** [[Series/BreakingBad Tuco]] is part of a trio of racists that give Jack trouble in Day 2.
** Doesn't look like [[Series/{{Supernatural}} Crowley]] or Castiel are getting back up anytime soon. That's not like them at all.
** What is it with [[Series/TheOC Julie Cooper]]'s menfriends and politics? First [[Series/TheOC Caleb Nichol]] is the Vice President (in seasons 2 and 3) and now [[Series/TheOC Jimmy Cooper]] is Chief of Staff (under President [[Series/KnotsLanding Greg Sumner]]) in ''24: Live Another Day''!
** [[Series/GameOfThrones Catelyn Stark]] is hatching an evil plot to take control of U.S. drones.
** [[Series/{{Chuck}} Sarah Walker]] is still working for the CIA.
** [[Series/TheWire Chris Partlow]] broke free from Baltimore prison and now works for the CIA, too.
** [[Series/JeevesAndWooster Jeeves]] has now become the Prime Minister of the United Kingdom.
*** [[Series/{{Spooks}} Jo Portman]] is alive and gets promoted to be his aide.
** [[Series/DoctorWho Lorna Bucket]] survived the Battle of Demon's Run and works behind a desk for the CIA.
** [[Franchise/PiratesOfTheCaribbean Mr. Gibbs]] became a Russian operative.
* HeyItsThatPlace: The Russian consulate in season 6 is the same building that was ''Series/{{JAG}}'' Headquarters.
* HeyItsThatVoice: Due to the sheer volume of characters and possible voice associations, examples of this trope have their [[HeyItsThatVoice/TwentyFour own page here]].
* IWantYouToMeetAnOldFriendOfMine: Victor Drazen has a personal vendetta against Jack Bauer. His actor Dennis Hopper coincidentally starred with Kiefer Sutherland in a 1990 comedy-drama called ''Flashback''. Jack's old friend Carl Benton was played by Creator/RobertCarlyle, and the two previously starred in a war film entitled ''To End All Wars'', which happened to come out just a few months before ''24'' premiered.
* KeepCirculatingTheTapes: Although the entire series is on DVD and can be streamed on Amazon, the "Previously on 24" recaps that originally appeared in the original airings of the first season have not been used again and have not been featured in any reruns, home video releases, or streaming services. It's extremely odd since the recaps from all other seasons are featured in reruns and home releases.
* LifeImitatesArt:
** Disclosed memos from within the former Bush administration suggest that, if ''24'''s [[JackBauerInterrogationTechnique torture methods]] didn't inspire the initial events at Abu Ghraib Prison and Guatanamo Bay Prison Camp, they at least inspired their justification and continuation to this day.
** On a less controversial note, the suspects of the Abu Ghraib abuses claimed ''24'' as inspiration for their tactics, and military intelligence instructors have complained to reporters that they have to drill ''24'' and its depiction of torture out of the heads of new students.
** The set of CTU LA also inspired the design of the real-life [[http://www.fbi.gov/about-us/nsb/image/national-counterterrorism-center-facility National Counterterrorism Center]].
* NamesTheSame: Both ''24'' and ''Series/{{Smallville}}'' have a kickass blonde hacker named Chloe.
* TheOtherMarty: Margo, the antagonist of "Live Another Day," which was originally supposed to be played by actress Judy Davis. As principal photography began though, Davis was forced to drop out because of family concerns, so the role was recast to Michelle Fairley.
* PlayingAgainstType:
** Chloe O'Brian is a [[TomHanksSyndrome rare dramatic role]] for comedian Mary Lynn Rajskub.
** Same goes for Janeane Garofalo as Janis Gold.
** StephenFry as the British Prime Minister.
* ShrugOfGod: The writers have not settled on what the ultimate fate of [[spoiler:Wayne Palmer]] was after the events of Day 6. A newspaper prop in ''24: Redemption'' viewable by [[FreezeFrameBonus freezing the movie]] indicates he died sometime between the sixth season and the movie, but the writers have stated that for all they know, he might still be alive. As of April 2014, he's labeled as "Deceased" on the 24 wiki.
* TropeNamer: ''24'' has named the following tropes on this wiki:
** JackBauerInterrogationTechnique: The use of force or downright torture during interrogation. No less than 67 scenes involving interrogation were counted in the first five seasons, many of them involving the inflicting of physical pain, and mostly involving Jack Bauer.
--> ''"You probably don't think that I can force this towel down your throat. But trust me, I can. All the way. Except I'd hold onto this one little bit at the end. When your stomach starts to digest it, I pull it out. Taking your stomach lining with it. For most people it would take about a week to die. It's very painful."''
** TrappedByMountainLions: [[invoked]]A subplot with no relation to the main storyline that is often used as {{Filler}} to give one or more characters something to do on-screen. Named for a subplot in season 2 where Kim Bauer is trapped in the wilderness by a mountain lion, an event that is often held to be irrelevant to the rest of the story.
* RealLifeRelative: The actors who played George Mason and Nina Myers married between the first and second season, making the interrogation between them in the latter rather interesting to watch.
* WhatCouldHaveBeen:
** Season 6's Darren [=McCarthy=] was initially cast as Creator/EddieIzzard, but he was forced to cancel due to scheduling reasons.
** The series was originally conceived as a comedy about preparing for a wedding. This would soon afterward see the light of day as ''Big Day'', though the show quickly crashed and burned.
** The actor who played Kevin Carroll (the false Alan York in the first season), Richard Burgi, was originally cast in the role of Jack Bauer. He would have had that role if they hadn't been able to get Kiefer. Once Sutherland was brought on board, Burgi accepted the role of Carroll.
** The producers toyed with the idea of casting Donald Sutherland [[RealLifeRelative as Jack Bauer's father, Phillip]].
** At one point, Joel Surnow wanted to acquire the rights to ''Literature/TheDaVinciCode'' in hopes of working it into a plotline for the show's third season, but Creator/DanBrown rejected him. How he would have worked Jack Bauer into a story about LeonardoDaVinci, Pagan cults and {{Jesus}}' family is anyone's guess.
** When a movie was still in the works, Tony Scott was considered to direct it. His suicide was one of the factors that ended the project.