Vaderisnothayden said:

Was that the thing in which he says Jar Jar is the key to the whole film?

I think it's in the same documentary. I remember Lucas describing TPM as a "War&Peace" film (lol). The best moment: when Lucas argues "i made More American Graffiti and grossed ten cents".

And one ver interesting moment: just before that, if my memory doesn't fail, Lucas is not convinced with TPM. Rick McCallum argues too exposition on the beggining of the film (!!) Nothing about the things that really sucked. At lest that documentary was true, and very good (the best thing in TPM DVD and PT trilogy DVDs indeed). It's interesting too thar AOTC and overall ROTS had the least amount of extras ever in the trilogy, and everyone seemed unmasked publicity.