Five days ago a friend sent me the Jamie Costa/Robin Williams "ROBIN test footage scene" clip, and wrote that he finds it "distracting when someone playing a real person is too accurate in voice and mannerisms, almost like they're doing an impression versus someone like Anthony Hopkins interpreting Richard Nixon. Despite it being a not great movie, Rod Steiger pulled off a respectable W.C. Fields. While this is uncanny, I'm not sure how it would wear over an entire biopic."