* FoeYay:
-->'''Vampire!Joker:''' Batsy... You complete me.
* InferredHolocaust: Vampire Joker and Batman have a brawl in a blood bank, Joker drinking gallons of it. Considering blood supplies are in short enough supply in the real world, that means hundreds, if not thousands, died because of lack of transfusions.
* HilariousInHindsight: This wouldn't be [[Film/TheDarkKnight the last time]] the Joker told Batman [[Film/JerryMaguire "You complete me."]]
** It also wouldn't be the last time Batman gives some of his own blood to Joker [[spoiler:in order to cure him of a type of virus. Something very similar to that happens in the ''Batman: Europa'' comic]].
* {{Narm}}: The "reveal" that {{Alucard}} spelled backwards is... DRACULA!
* NightmareFuel:
** Howdy, Vampire Joker. I'm gonna go turn on all the lights now...
** '''Lick. Liiiiiiiiiiick. LIIIIIIIIIIIICK.'''
** What about Vampire Batman?
** [[spoiler:Dracula's death]] in all its gruesome detail.
** Joker being electrocuted by his own buzzer as he falls into the water, with flashes of lightning under the surface to emphasize the FamilyUnfriendlyDeath. [[spoiler:Though he gets better eventually]].
* WhatDoYouMeanItsNotForKids: While definitely lighter in tone than the later [[WesternAnimation/DCUniverseAnimatedOriginalMovies DCUAOM]] movies, the fact that it was based on (the kids friendly) ''WesternAnimation/TheBatman'' caused Toonami to mistakenly give it a TV-Y7 rating during its first airing and only later upgrading it to a (much better fitting) TV-PG.
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