This is from the documentary:
WARNING: Crumb draws nude figures in this clip- kind of big shaped ladies... so if you're offended by his cartoons then I guess don't watch. This clip also contains some of his cartoons of a sexual nature. The film, though, is a really great glimpse into an amazing mind (in my opinion). I just loved watching him sketch. I will say that there was one cartoon that they showed in the film that I was perplexed by. Many of his supporters thought it was offensive and it was. Crumb is a complex man with many insecurities and these feelings show in his work. This is why the film is great - it shows both the good and bad, and is both a praise and a critique.