* ActorAllusion:
** Near the end of the game, Hugo Strange says "This is just the beginning", a line said near the end of ''Film/AttackOfTheClones'' by Count Dooku, who Corey Burton [[WesternAnimation/StarWarsTheCloneWars has played]].
** A subtle one: Joker attempts to force Mr. Freeze to develop a cure for him by holding his wife hostage. Joker is voiced by Creator/MarkHamill, whose first voice in ''WesternAnimation/BatmanTheAnimatedSeries'' was Ferris Boyle, the guy responsible for Mr. Freeze, and Mark's performance as him also landed him with his voicing ComicBook/TheJoker in that series. Furthermore, by reading one of the riddles called "Who can BOYLE and Freeze at the same time?" and listening to the Mr. Freeze audio tapes, you find out that Ferris Boyle is canon in the Arkhamverse.
** MPT Anne Bishop is voiced by Kimberly Brooks. Given the character's looks and personality (her first question when Batman rescues her is where's Riddler, clearly intending to remove his spine), chances are that [[Franchise/MassEffect Ashley Williams]] will come to mind.
** Catwoman is voiced by Music/GreyDeLisle so chances are she'll remind some people of [[WesternAnimation/TUFFPuppy Kitty Katswell]].
* BeamMeUpScotty: Many have misquoted or misinterpreted Mark Hamill as saying this game will be the last time he plays The Joker. He clarified that what he meant was he wouldn't continue playing The Joker if he felt that he couldn't top his performance, he wanted to leave on a high note. That said, [[https://twitter.com/#!/HamillHimself/status/126561371197419520 this]] would seem to suggest that he has no plans to play the Joker again in the future. [[spoiler: Then came ''VideoGame/BatmanArkhamKnight''...]]
* {{Blooper}}: [[spoiler: As the generator slams Clayface into the Lazarus Pit and explodes, the vial holding the cure is in Batman's left hand, but when he comes to, it's in his right one. Until ''Arkham Knight'' confirmed the Joker died, some people speculated that it was intentional, and the Joker took some of the cure and was faking his death. After ''Knight'', though, it's become clear that it was indeed a screw-up.]]
* CastingGag: Creator/FredTatasciore as Solomon Grundy. He's also known for playing ComicBook/TheIncredibleHulk, another [[AmazingTechnicolorPopulation green]] [[TheDreaded monster]] with [[TheBrute enormous strength]], [[HulkSpeak broken speech]], and [[DumbMuscle limited intelligence]].
* DevelopmentGag: At one point, Batman overhears thugs talking about the rumor that Harley Quinn used to be a man. Harley Quinn was actually motion-captured by a man, and they even released a [[http://www.geekologie.com/2011/09/oh-shishi-its-sexy-time-harley-quinns-mo.php fake reveal trailer]] to tease fans about it.
* FanNickname: Robin's is [[MythologyGag Robin]] [[VisualPun Hood]].[[labelnote:*]]In his very first appearance, Dick Grayson said his name was "Robin, as in Robin Hood... not robbing hoods!"... hey, it was [[UsefulNotes/TheGoldenAgeOfComicBooks 1940]].[[/labelnote]]
* TheOtherDarrin: Creator/TaraStrong replaces Arleen Sorkin as Harley Quinn, DavidKaye replaces Creator/TomKane as Commissioner Gordon, and Music/GreyDeLisle replaces Tasia Valenza as Martha Wayne. The latter two are perplexing since, as noted above, Tom and Tasia returned from the first game to reprise the respective roles of Quincy Sharp and Poison Ivy.
* PlayingAgainstType:
** Creator/NolanNorth as the Penguin.
** Creator/DeeBradleyBaker as Ra's al Ghul.
** Creator/MauriceLaMarche as Mr. Freeze and Calendar Man.
** Creator/TaraStrong as Harley Quinn.
* TalkingToHimself: Creator/NolanNorth voices both [[LondonGangster The Penguin]] and provides the voices of several randomized inmates. It's not unheard of to hear NolanNorth {{b|adBoss}}erating his {{Mooks}} about how much they suck, only to hear Creator/NolanNorth reply "You heard Penguin! Let's move!"
** [[spoiler: Hush]] is also voiced by Creator/KevinConroy for obvious reasons.
* ViralMarketing: Starting in early October 2011, major Website/YouTube [[Creator/{{Polaris}} TheGameStation]] affiliates Creator/HuskyStarcraft, WebVideo/OMFGCata, [[Creator/TheCynicalBrit TotalHalibut]], and the LetsPlay/{{Yogscast}} left mysterious Riddler question marks in their daily videos: Each one linked to an unlisted Website/YouTube video part of a four-part audio involving Professor Strange and Two-Face that promoted the game and its Facebook page.
* WhatCouldHaveBeen
** In an interview, director Sefton Hill said they wanted to include a reference to the infamous Bat-Shark Repellent Spray from the Adam West series[[note]]Reportedly, when confronted by "Tiny" in the Iceberg Lounge, Batman would break out the repellent... then open it up to reveal a set of brass knuckles[[/note]], but ended up nixing it because they felt it was a LevelBreaker. There's still a subtle reference; if you get killed by the shark, one of the possible hints reminds you to remember Batman's shark repellent: a flurry of blows to drive it off. In one room, you can listen to the Riddler mutter about ways to take down Batman, and ponders taking Penguin's shark, only to say that there are "too many variables", and that Batman likely has some sort of "shark contingency".
* The plot itself borrows ideas from ''ComicBook/{{Knightfall}}'' and No Man's Land, among other famous Batman stories. A lot of the Joker/Batman dynamic is reminiscent of ''ComicBook/TheKillingJoke''.
* ''Arkham City'' was released the same day as the AnimatedAdaptation of ''Comicbook/BatmanYearOne'' and shares a lot of the same voice talent: Creator/GreyDeLisle (Catwoman, Vicki Vale, Stacy Baker, Martha Wayne) is Barbara Eileen-Gordon and Vicki Vale, Creator/SteveBlum (Killer Croc and Sickle) is Stan, Creator/FredTatasciore (Bane, Solomon Grundy and Mr. Hammer) is Arnold Flass and Johnny Vitti, and Danny Jacobs (Victor Zsasz) is Flass's lawyer.
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