It is that rare documentary about a movie which gives you far more than info on the movie, though it certainly does give you all you need and want to know about the history of the film and its production. However, it also gives you a fascinating history of the era in which it was made, everything from anti-Semitism and isolationism to rural America and WW II.
I can't recommend this highly enough. My only complaint would be that it is too short. It moves along so smoothly, the story-telling -- for that's what it is, the history lesson is nothing less than beautifully crafted story-telling -- is so effortless. that it's over before you know it.
This is how these "making of" docs should be done! Could use this in both film class and history class.