Just finished watching the documentary on THE ROARING TWENTIES DVD. I had seen the movie before, but if you haven't, don't dare watch the documentary before you watch the film. It stupidly gives away some key action at the end of the film.
Dr. Drew, from USC Film School. He looks so familiar. I guess he's been used in other documentaries, but he also looks a little like an actor I've seen before in the movies.