It is not too surprising that even in a mainstream non-horror feature such as “A History of Violence,” David Cronenberg offers a subplot that harks back to his earlier works. And it is pure Cronenberg. Cronenberg, 63, agreed, then disagreed, in a phone interview from Los Angeles. “Yes, I understand what you’re saying, but (screenwriter) Josh Olson had already written that subplot into the film before I read the first draft. So although I had nothing to do with its creation, it was one of the elements that most appealed to me.” John Stanley speaks to Cronenberg about the film.