* 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 Creator/BrandonRouth, 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.
** Creator/PhilLaMarr, who voices [[ShockAndAwe Static]] in the DCAU, voices [[PsychoElectro Maxie Zeus]] on The Batman.
** A likely unintentional one, but in "Topsy Turvy" Bennett tells Yin that they need to free Joker's hostages from the Palace Theater before Batman and Joker "bring down the house." Steve Harris, Ethan's voice actor, played the antagonist Widow in the 2003 film ''Film/BringingDownTheHouse''
* CastingGag:
** The Flash is voiced by Creator/CharlieSchlatter, who voiced the Flash on ''WesternAnimation/SupermanTheAnimatedSeries'', though the ''S: TAS'' Flash was Wally West.
** Dorian Harewood has played [[WesternAnimation/BikerMiceFromMars a Martian hero]] before.
** Ian Abercrombie appeared in "The Icy Depths" as Ewan Fripp, an old friend of Alfred's. On the short-lived ''Series/BirdsOfPrey'', Abercrombie played Alfred.
** Creator/KevinConroy, who [[WesternAnimation/BatmanTheAnimatedSeries previously]] [[WesternAnimation/JusticeLeague voiced]] [[WesternAnimation/BatmanBeyond Batman]], voiced John Grayson in "A Matter of Family."
*** Likewise, Mark "The Joker" Hamill as "Boss" Tony Zucco.
* 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 ''WEsternAnimation/JusticeLeagueUnlimited'' (another reason for the dislike ''The Batman'' gets).
* ExiledFromContinuity: Scarecrow and Two-Face weren't allowed to show up due to their appearances in ''Film/TheDarkKnightSaga'', which resulted in a rewrite for "Strange New World" and Clayface filling Two-Face's role.
* FanNickname: This version of the Joker is commonly referred to as "Dreadlock Joker".
* IKnewIt: Before [[WordOfGod producer Jeff Matsuda]] [[http://www.toonzone.net/forums/showpost.php?p=1902711&postcount=58 confirmed it]], many fans had speculated that the officer in the flashback in "Traction" was a young Jim Gordon.
* TheOtherDarrin:
** Chief Rojas was voiced by Creator/EdwardJamesOlmos 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 Creator/JoaquimDeAlmeida 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 ComicBook/TheJoker. He normally voices villains that are deep voiced and intimidating, not brutish and insane.
** 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 Creator/MorganFreeman.
* ScrewedByTheNetwork: While it wasn't suffering any ratings or timeslot issues, it was basically canceled by order of Creator/FourKidsEntertainment as the fifth season was in the middle of production. Why? [[Creator/{{Toonzai}} So that they could start their own block, of course]]. Luckily it managed to remain on Kids' WB replacement for a few more months, just for the sake of reruns, before quietly disappearing.
* TalkingToHimself:
** Both Ragdoll and Killer Moth are voiced by JeffBennett, and they shared quite a few scenes together in "Team Penguin".
** The ColdOpen of "Rumors", which had Killer Croc fighting Rumor. Both of them are voiced by Creator/RonPerlman.
** A more literal example was in both "Strange Minds" and "The Metalface of Comedy", in which there were multiple Jokers, all of them voiced by Creator/KevinMichaelRichardson.
* 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 adaptation of ''Hush''. Likewise, the villain on ''Rumors'' was originally supposed to have been Hush, too.
** It's been rumored that ''Music/MarilynManson'' was originally cast to voice The Riddler ([[InkSuitActor which would explain the character design]]).
** Some of the concept art features Penguin looking far more cartoonish, the Riddler looking more like this show's incarnation of Cluemaster, and the aforementioned Scarecrow, whose design implemented chains and a sickle.
----