The producers state this is the very first DC Comics film that opens up to a cinematic universe for its heroes: "Batman is being brought into the universe that now this Superman lives in."

Ben Affleck began working out two hours a day daily the very next day after he was cast as Batman, to get ready for the role.

Ben Affleck is 18 months older than Christian Bale marking the first time the actor taking on the role of Batman/Bruce Wayne is older than the actor who last played the role in a live action movie. All other Batman roles the actor succeeding the role has been younger than the actor who previously played the character. Val Kilmer took the role from Michael Keaton and he is 8 years younger. George Clooney who is 18 months younger who took the role from Kilmer. Bale is 13 years younger than Clooney.

The film is influenced by the graphic novels "Batman: The Dark Knight Returns" (where Superman and Batman clash over opposing views), "Kingdom Come" (Batman uses an army of drones) and "Batman: Noel" (a stone-hearted Batman rediscovers his humanity).

At one point the film was rumored to be split in two parts. Part one titled "Batman v Superman: Enter the Knight" and having a release date in 2015, and part two, the one everyone is familiar with "Batman v Superman: Dawn of Justice" having the original release date of March 25, 2016.