Green Book bills itself as a comedy-drama “based on a real life friendship” between a gifted and refined concert pianist, Donald Shirley (played by Mahershala Ali), and Frank Anthony “Tony Lip” Vallelonga (played by Viggo Mortensen), a nightclub bouncer whom Shirley hires as his driver for a tour through the American South. The movie is directed by Peter Farrelly of Dumb and Dumber and Shallow Hal, and if it were a simple buddy comedy about the hijinks that are bound to happen when you put a p...