Plot hole: The film makes many references to the previous films and TV series as evidence of Batman's desire to be alone, but in the TV show and two of the films Robin has been established as his sidekick already.
The Lego Batman Movie (2017)
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Directed by: Chris McKay
Starring: Ralph Fiennes, Will Arnett, Zach Galifianakis, Jenny Slate
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Robin: My name's Richard Grayson, but all the kids at the orphanage call me Dick.
Batman: Well, children can be cruel.
Trivia: In the Justice League party there are several cameos from the old members of the league like Black Vulcan, the fantastic twins, Hawkman and Hawkgirl, Apache chief, El dorado, and Samurai.
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Answer: Goof.