Ben Affleck put on 40 pounds for his role as Batman in the film, with a 5000 calories a day diet.
British actress Lucy Griffiths was considered for the role of Wonder Woman.
Executive producer Christopher Nolan directed a Batman-movie trilogy: Batman Begins (2005), The Dark Knight (2008) and The Dark Knight Rises (2012). This movie is a reboot from Nolan's Batman films.
This is the second superhero film that Ben Affleck has played a starring role. The first was as Matt Murdock/Daredevil in the film Daredevil (2003). Similar to Batman, Daredevil was also a martial artist and was driven to crime-fighting due to the death of a family member.
The title Batman v Superman: Dawn of Justice is a reference to the Justice League.
Timothy Dalton was considered for Alfred Pennyworth.
Both Ben Affleck (Bruce Wayne/Batman) and Diane Lane (Martha Kent) appeared in Hollywoodland (2006), where Affleck portrayed George Reeves, the actor best known for playing Superman on television.
Gal Gadot is the first non-American actress to play Diana Prince/Wonder Woman.
For the role of Lex Luthor, Adam Driver auditioned but ultimately turned down the role due to scheduling conflicts and Joaquin Phoenix passed on the role.
Adam Driver, Penn Badgley and Ezra Miller auditioned for the role of Batman's sidekick Nightwing.
Jesse Eisenberg previously appeared in The Social Network (2010), which was co-produced by the previous Lex Luthor, Kevin Spacey.
A great deal of anticipation and excitement was created over the changes in the costumes of the superheroes, as they were aimed at exhibiting a sense of evolutionary refinement in the design. The changes were made after several stages of testing, with a thorough series of camera tests and final tweaks completed prior to shooting.
The director Zack Snyder, likes to fine tune the process of filming and requires a great deal of focus and concentration from his actors, which helps in creating intense and intimate moments that cannot be planned.
A third character with super-powers, Wonder Woman is also slated to play a role in this movie.
Actress Amy Adams had to try on more costumes than she ever has in her acting career so far, more than 200 costumes until the final choice was made.
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