Peter Bogdanovich’s new documentary about Buster Keaton, The Great Buster, is a match made in movie heaven. I can’t think of two men more devoted to making motion pictures — huge successes in their day — more acquainted with the merciless climate of Hollywood, or more aware that they were as instrumental in their own downfall as in their glory. ‘Buster said he made the great mistake of his life in 1928,’ says Bogdanovich. ‘He had done these masterpieces in the 1920s — Steamboat Bill Jr, Sherlock Jr, The Navigator, The General — and done them the way he wanted with his own production unit... It couldn’t get any better. But then [he was] told to sign with MGM. And Buster was never the same again. The studio interfered in his pictures.