The movies “Color Me Kubrick” and “The Hoax” concern the same sort of con: the kind that is dependent on a famous but elusive figure. “Those cons probably couldn’t happen today; in a time when no public record or paparazzi snap is likely to stay hidden from snoopy Web sites, the cult of the invisible celebrity has become all but obsolete. The best evidence of that change comes with Oprah Winfrey’s recent announcement that the brilliant, press-shy novelist Cormac McCarthy will do his first television interview on her show….”