Naya Rivera's final film role.
This is the fifth animated Batman movie to receive an R rating after Batman: The Killing Joke, Batman: Gotham by Gaslight, Batman: Death in the Family, and Batman: Soul of the Dragon.
Inspired by the iconic mid-1990s DC Comics story from Jeph Loeb and Tim Sale.
Unlike other Batman movies, Alfred refers to Mr. Wayne as "Sir" and not "Master Bruce."
Two-Face's gun had four bullets each, (2x2) so he had eight bullets. He used six in the fire fight and the last two to kill Falcone.