Mmhm, I'm sure you've seen this movie because it's so cool. I did yesterday in the process of watching myself through what Luci left on the hard drive.
I found it hilarious how the movie plays with one's expextations of and reverence for the serious ambiance of "real documents" (it pretends to be a documentary but isn't - it tricked me for quite a while!:) and of interviews with the affected people grown old, and saying in all earnest the most outrageous things (earnest because it's a documentary, of course). And I still catch myself thinking "wow, so even in the twentys they had this amusement-vocab? well That says something about America!" Somehow everything (the winner-tone of the narrator, the scenes themselves) has lots of self-irony this way.
But at the same time, it has this whole Baudolino-athmosphere of how you can make believe anything, as long as You are serious about it...