The LEGO Movie's version of Batman is not exactly the same guy that prowled the streets of Christopher Nolan's Gotham. So, according to producer Dan Lin, the production went to both Nolan and Warner Bros. to make sure Will Arnett's horrible boyfriend version of Batman was okay.
Speaking at the Animation Roundtable, Lin said:
We approached both Warners and Christopher Nolan. And myself, Chris Miller and Phil Lord, we pitched a different kind of Batman. We said, "You guys have your live-action Batman, we have what we called the Lego Batman. A Batman that's very self-aware. That is, you know, a bit of a jerk at times." As soon as they understood there are different universes, that worked out OK. But that was a big challenge going to all the different rightsholders, saying, "This is how we're going to take your character and Lego-ize it."