There are a variety of great documentaries about famous films and film artists. Two of the most successful producers of these movies are Joan Kramer and David Heeley. Their book
In the Company of Legends (Beaufort Books, 2015) is a great memoir of their careers presenting the lives of such people as Katharine Hepburn, James Stewart, Johnny Carson, and many others. In this interview, they give some great background anecdotes that illustrate their experiences.