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In the PS4, Xbox One, PC and Wii U versions of the game, hovering over most character portraits in the select screen for a few seconds will prompt them to sing the theme song from The 1960s Batman TV show. Superman and Wonder Woman have a similar Easter Egg where they sing the classic theme from their own respective TV shows.
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Attachment In the Hall of Doom, a Weeping Angel from Doctor Who can be found. Every time you move the camera away from it, its hands will move from its face and then cover it back.
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During the Announcment Trailer, Wonder Woman critisized Batman's Space Suit by saying he "should have stuck with black, or a very dark grey." This is a refrence to Batman's similar line in The Lego Movie.