Earlier this month, author Percival Everett put on a tuxedo to attend the Academy Awards with his wife, novelist Danzy Senna. First-time filmmaker Cord Jefferson, who adapted Everett’s 2001 novel “Erasure” to make the film “American Fiction,” won for best adapted screenplay and delivered a rousing acceptance speech that was one of the evening’s highlights. “I like the film quite a bit, and I appreciate the fact that it is not my novel.