Pretty good review! Just want to clarify on a couple points that were a bit fictionalized in the review. One thing is, Robert's older brother Charles said he bathes once every six weeks (a little more often than twice a year) and his younger brother Maxon has more going on than just the long strip of cloth, which is once every week or two if I remember correctly, and the bed of nails which is one or two hours a day. He also at the time would go out daily with a begging bowl and sit on the concete, as if it were his duty, and is quite a talented painter of modernistic abstract designs that might be considered more in the genre of Picasso than of R. Crumb -- but with even more disturbing art, in my opinion, than either his brother or Picasso. (Since this film I believe there is a book out of Maxon's paintings and he still lives in the dilapidated room in San Francisco last I heard.)
Crumb's two sisters are barely mentioned in the film. I often wondered why. I found out one reason why recently in a couple interviews I read -- one with R. Crumb and the other with Terry Zwigoff. R. Crumb's younger sister Sandra, (a rare photo of which can be seen in one of Crumb's comic collections called something like "Crumb's Crazy Family" but a different title than that, that's just the best I can remember right now), grew up to become a man-hating lesbian of whom it was said hated men so much that she never allowed men to enter her home, with the one exception of one little boy (because the little boy was her son). She reviled Crumb for what she considered his hatred toward women and sued him for restitution. I believe she was demanding $400 a month from him. She passed away. (I believe it was liver disease, which interestingly is considered by Chinese medicine to be the organ in which anger causes a lot of problems.) I have not learned much of Crumb's older sister Carol except that she seems to have chosen the most conservative and normal-seeming lifestyle. (Though I suspect she is not at all normal and a portrait of her life would be as fascinating as her other siblings but just in another way.) Sadly, R. Crumb's older brother Charles committed suicide before this film was released.