In an interview on Late Night with Jimmy Fallon (2009), Ben Affleck said he was warned by Warner Bros. about the possible negative reaction to his casting, and was advised to remain off the Internet after the casting announcement. He also said, to assuage his concerns, the studio showed him negative comments that fans had initially made to previous superhero castings. Affleck said in spite of the studio warnings, he still checked out an online message board. The first comment he read was, "Affleck as Batman? NOOOOOOOOO!!!!!!!!!!!" After seeing that, he immediately went offline.
In this film, Batman wears a voice modulator in his suit to electronically alter his voice. After the casting of Ben Affleck in the role, this was an idea that had been suggested by his friend, director Kevin Smith, as he felt Affleck's natural speaking voice was too high-pitched for Batman. He also felt it wouldn't sound like Christian Bale's voice in the Christopher Nolan Dark Knight trilogy.
Ben Affleck gained an additional twenty pounds of muscle and reached eight percent body fat for his role as Bruce Wayne a.k.a. Batman.
In response to the negative and mixed reviews, Ben Affleck (Batman) said "We made this movie for the fans, not the critics." His co-star Henry Cavill (Superman) said similar things in other interviews.
According to Ben Affleck, he was surprised when he was offered the Batman role, and was at first hesitant to commit to it. He was won over after a meeting with Zack Snyder, who pitched Affleck his vision of Batman, and showed him concept art for the film.
C.T. Fletcher: The inmate that the KGBeast enlists to kill the branded inmate is a fitness expert, known as the Compton Superman, and frequently wears Superman shirts in his YouTube videos.