* ActorExistenceLimbo: Due to having numerous {{Celebrity Voice Actor}}s, some villains were reduced to cameo roles after their debut episodes.
* ActorAllusion:
** "The Big Dummy" sees Bruce putting off a date with a woman named Becky, voiced by Creator/JenniferHale. It isn't the first time a character voiced by Hale served as a love interest to a superhero voiced by Creator/RinoRomano, but in [[WesternAnimation/SpiderManUnlimited those]] [[KnightsOfTheOldRepublic other]] [[VideoGame/SpiderMan cases]], they did hook up and actually had a relationship.
** John Marlowe, voiced by Brandon Routh, who plays {{Franchise/Superman}} in ''Film/SupermanReturns'' mentions how [[ClarkKenting he has a confident, cool persona]] when he is [[SecretIdentityIdentity more comfortable being the shy geek]]. He is also in a relationship with Clea, voiced by Allison Mack, who plays Chloe Sullivan in ''{{Series/Smallville}}'', who had a long-time crush on Clark.
** Phil [=LaMarr=], who voices [[ShockAndAwe Static]] in the DCAU, voices [[PsychoElectro Maxie Zeus]] on The Batman.
* AuthorExistenceFailure: Frank Gorshin died after Strange's third appearance was recorded.
* CowboyBebopAtHisComputer: Several online descriptions for DVD sales of season one would describe the series as taking place after ''Film/BatmanBegins''. [[http://hmv.com/hmvweb/displayProductDetails.do?ctx=280;-1;-1;-1;-1&sku=517272 Here's one of them]].
* ExecutiveMeddling - Some of the intellectual property from Batman was being used in multiple adaptations (all owned by the Warner Brothers, however). Not wanting to create conflict between different adaptations' interpretations of characters, some things were off-limits for the writing staff. Here are specific examples:
** Robin was forbidden from appearing until ''WesternAnimation/TeenTitans'' was canceled, meaning Batgirl actually becomes a sidekick ''first'', which makes for an interesting mythology shake-up and promotes her from the usual third-fiddle.
** Some of the villains used in the Film/TheDarkKnightSaga, most notably Scarecrow and Two-Face, were also forbidden from appearing. Clayface was used in place of Two-Face for the "best friend turned into a criminal" schtick. The episode "Strange New World" was written to introduce Scarecrow, but once the writing staff found out that he was still off-limits, they opted to go with Professor Hugo Strange instead.
** All of the above is very ironic, considering the "Bat-Embargo" this series imposed onto ''JusticeLeagueUnlimited'' (another reason for the dislike ''The Batman'' gets).
* HeyItsThatVoice:
** Creator/RinoRomano is Batman.
** Creator/KevinConroy and Creator/MarkHamill show up in Robin's debut episode, appropriately enough voicing his father and Tony Zucco, the man who kills Dick Grayson's parents.
*** Also, a few other voice actors from the {{Franchise/DCAU}} came to ''reprise'' their roles (namely [[Creator/ClancyBrown Lex Luthor]], [[Creator/GeorgeNewbern Superman]], and [[Creator/DanaDelany Lois Lane]]).
** And the obligatory [[AdamWesting Adam West appearance]]... [[WesternAnimation/FamilyGuy as the mayor]] of Gotham.
** Frank Gorshin (The Riddler from [[Series/{{Batman}} the Adam West series]], RIP) voices, if you can believe it, Hugo Strange.
** The Riddler is voiced by Creator/RobertEnglund.
** TomKenny is the Penguin.
** SelfDemonstrating/TheJoker is voiced by Creator/KevinMichaelRichardson.
** Brandon Routh ([[Film/SupermanReturns another Superman]]) is Everywhere Man. And the blonde chick in that episode is [[{{Series/Smallville}} Chloe]].
** [[Film/SpyKids Juni Cortez's]] real-life twin is Robin while Juni Cortez himself was Wrath's Robin, Scorn.
*** Wrath himself is Series/{{Jake 20}}.
** Ellen Yin is {{Disney/Mulan}}.
** Ethan Bennett is [[ThePractice Eugene]].
** Commissioner Gordon is [[Series/TheXFiles A.D. Walter Skinner]].
** Basil Karlo is [[Series/{{CSI}} Hodges]].
** Cluemaster is [[Film/{{Beetlejuice}} Otho]].
** Francis Grey is [[WesternAnimation/ABugsLife Flik]].
** JasonMarsden is Firefly.
** Mercy Graves is [[Series/DesperateHousewives Xiao Mei]], [[VideoGame/FinalFantasyX2 Paine]], and [[WesternAnimation/WolverineAndTheXMen Domino]].
** Creator/WillFriedle is Gearhead.
** Hawkman is [[{{Terminator}} the T-1000]].
** Toymaker is voiced by Creator/PattonOswalt.
** Creator/RonPerlman ([[WesternAnimation/BatmanTheAnimatedSeries Clayface]], [[WesternAnimation/JusticeLeague Orion]], [[WesternAnimation/TeenTitans Slade]]) is Killer Croc and Rumor.
** Ragdoll and D.A.V.E are both voiced by Creator/JeffBennett.
** Jimmy Olsen is [[WesternAnimation/AvatarTheLastAirbender Sokka]].
** Chief Rojas was originally [[Film/BladeRunner Gaff]] and [[Series/BattlestarGalacticaReimagined William Adama]].
** Nightwing is [[WesternAnimation/JusticeLeague Captain Marvel]], [[{{Sliders}} Quinn Mallory]], and [[CrossingJordan Woody Hoyt]].
** GreyDeLisle is Robin's mother and Vulture of the Terrible Trio.
** Fox of the Terrible Trio is [[MarriedWithChildren Bud Bundy]].
** Lucius Fox is [[Film/AnOfficerAndAGentleman Emil Foley]]/[[Film/IronEagle Charles Sinclair]].
** Black Mask's original Number One and Shadow Thief are voiced by DiedrichBader.
** HyndenWalch is [[PlayingAgainstType Harley Quinn]].
** The Flash is [[Series/DiagnosisMurder Jesse Travis]] and [[WesternAnimation/SupermanTheAnimatedSeries another Flash]].
** Martian Manhunter is [[BikerMiceFromMars Modo]] and [[WesternAnimation/IronMan War Machine]].
** Mirror Master is [[NightCourt Dan Fielding]].
** Dr. Langstrom is [[AllyMcBeal John Cage]], [[WesternAnimation/JusticeLeague Chronos]], and [[WesternAnimation/TheSpectacularSpiderMan Doctor Octopus]].
** Poison Ivy is [[VideoGame/WarcraftIII Sylvanas Windrunner]].
** Sinestro is [[Disney/{{Mulan}} Shan Yu]].
** Cash Tankenson, Ethan Bennett's temporary replacement, is voiced by Creator/PatrickWarburton.
** Mr. Freeze is voiced by Creator/ClancyBrown, who as noted above, also reprises the role of [[Franchise/{{DCAU}} Lex Luthor]].
** Alfred is [[LegacyOfKain Mortanius]].
** PeterStormare is Count Dracula.
** Creator/TaraStrong is Vicki Vale.
** Creator/GinaGershon is Catwoman.
** In the Japanese dub of the series, Mr. Freeze is voiced by Creator/TesshoGenda, who played Batman in the Japanese dub of ''WesternAnimation/BatmanTheAnimatedSeries''.
** Batgirl is voiced by Creator/DanielleJudovits.
** Creator/RachaelMacFarlane is Blaze.
** Creator/LexLang is Metallo.
** Creator/JimCummings is Temblor.
** Creator/PhilLaMarr is Maxie Zeus.
** Creator/DanCastellaneta is the Ventriloquist and Scarface.
** Black Mask is [[WesternAnimation/Ben10AlienForce Vilgax]], [[Film/{{Transformers}} Sideswipe]], [[WesternAnimation/JusticeLeague Hawkman]] and [[Series/{{Dexter}} Harry Morgan]].
** Spellbinder is [[UltimateAvengers Bruce Banner]].
** Solomon Grundy is [[{{Underworld}} Raze]].
** Count Vertigo is [[WesternAnimation/TeenTitans Malchior]].
** Prank is [[Anime/DigimonAdventure Matt Ishida]] and [[Manga/{{Naruto}} Mizuki]].
** Latin America: In Mexico, Batman was [[WesternAnimation/TotalDrama Trent/Sam]]; meanwhile, in Brazil, he was another contestant: Justin.
* TheOtherDarrin: Rojas was voiced by Edward James Olmos in his first appearance, then by Jesse Corti in all of his other ones.
** Richard Green replaced Frank Gorshin as Strange after the latter's death.
** Bane was voiced by Joaquim de Almeida for his debut in "Traction," then by Creator/RonPerlman for his cameo in "Team Penguin," then his grunts by Creator/ClancyBrown in "The Batman/Superman Story."
* PlayingAgainstType: Creator/KevinMichaelRichardson as SelfDemonstrating/TheJoker.
** ComicBook/HarleyQuinn is something you normally don't expect Creator/HyndenWalch to do.
* RecursiveAdaptation: Lucius Fox is based a good deal of Film/TheDarkKnightSaga's version of Lucius Fox--an old friend of Thomas Wayne, knows Bruce is Batman, and is an armorer for the Dark Knight. Goes into ComicBookFantasyCasting territory in that this incarnation looks a good deal like MorganFreeman.
* WhatCouldHaveBeen - As mentioned in ExecutiveMeddling, the original idea of what became ''Strange New World'', the villain was the Scarecrow, but as he was still off-limits, he was replaced with Hugo Strange. However, given the episode's plot, it was probably for the best as he'd have given the twist away. Likewise, a proposed but rejected idea of a follow-up DTV to ''The Batman VS. Dracula'' would be an adaption of ''Hush''. Likewise, the villain on ''Rumors'' was originally supposed to have been Hush, too.
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