I've just watched the film. The dialogue was superb - you could hear the majestic cadences of the King James Bible in John Ridley's brilliant screenplay.
I don't know if I've related this anecdote before, but at a KJV seminar at the University of Exeter a couple of years ago, I heard a speaker, a distinguished theology scholar who had at one time been responsible for the organisation of worship at Harvard University chapel, tell how once she had asked a guest black preacher what verses from the Bible he intended to use in his sermon. I think as she did so she made a gesture toward the pew Bibles in the chapel - the New International version. He waved them aside calling them "white men's Bibles" and as he did so, he produced from his pocket the Bible he intended to use. "This is the black man's Bible," he declared. Of course it was the now so despised KJV that he flourished at her. The same book ironically that the vicious - Edward Epps was it? - plantation owner in the film held aloft, proclaiming to his slaves, "That's scripture!"