* CastingGag:
** JensenAckles is [[Series/{{Supernatural}} once again playing a]] BadassNormal who [[spoiler:comes BackFromTheDead and has some ''serious'' daddy issues]].
** Creator/NeilPatrickHarris is once again playing a [[WesternAnimation/SpiderManTheNewAnimatedSeries chatty superhero]], & [[HowIMetYourMother someone notorious for his]] [[AnythingThatMoves tendancy to get women into bed]].
* DigitalPiracyIsEvil: The movie was leaked online a full two-weeks before its intended DVD release, available for download on at least two separate file-sharing websites on July 13, 2010. Didn't stop it from being one of the best selling of the DC series films, though.
* PlayingAgainstType: JohnDiMaggio as SelfDemonstrating/TheJoker.
* WhatCouldHaveBeen: The film was originally going to be R-rated, but Warner Animation convinced the staff to tone it down to PG-13. The preview of the movie included with ''WesternAnimation/JusticeLeagueCrisisOnTwoEarths'' contains clips of the R-rated version of [[spoiler:Joker killing Jason]], which are noticeably bloodier and more violent than the final product.
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