Most people think that Hidden Fortress inspired Star Wars because it’s about trying to save a princess but apparently George Lucas said the thing he stole was the idea of the epic story being told through the two smaller characters, the two peasants who inspired C3PO and R2D2. Of course Yojimbo is the one that’s probably been ripped off the most.

Crumb - It’s a masterful bit of documentary filmmaking and has been one of my favorite films ever since I saw it, and the critical acclaim for it has always been huge. And to answer your first question, Crumb did get in a small amount of trouble recently, in response to the Charlie Hebdo incident (he still lives in Paris):

https://www.theparisreview.org/blog/2015/01/12/a-kind-of-sleaze/

That’s the last I remember hearing of him. I also recall posting this hate-blast of an article on Babble back in the day…

https://observer.com/2016/04/robert-crumb-is-dead/

…and it got Paul C to claim that “so much journalism these days is like elaborate trolling” and someone else (A Smith I think) to call the article a shit stain. In retrospect it isn’t a very good article and I probably should not have posted it.

Maxon Crumb was a convicted sex offender and I recall thinking Maxon was sort of cool up until the story about him pulling the woman’s pants down, which now is just terrible and embarrassing. He still lives in San Francisco and some of his art has gotten attention.
Charles Crumb was a very sad story, the nasties on Babble made fun of him (Derrick Stuart used to fake Bryan Jackson by posting as him with the subject line “MY REAL NAME IS CHARLES CRUMB”), he was 49 when he died, but today there are 68 year olds who look younger than he did. The on screen text informing of the suicide hit me like a knife in the gut, though I have to admit no it’s not very surprising that he would kill himself. Although he was a very sad person, it’s probably for the better that he didn’t leave the house (he was, after all, openly admitting on screen to being sexually attracted to that young boy in the pirate movie, so he’d probably have been a child molester if he’d been outgoing–and Maxon, of course, would have probably been a flat-out rapist). I will also state that him talking about how he was a narcissist who wanted to get a knife and stab Robert to death, while itself a disturbing scene that Robert laughs off, was the first that I ever got to thinking about narcissistic personality disorder and what it actually was, because before that I thought “narcissism” meant you liked to look at yourself in the mirror too much, or something.
I read a couple volumes of his comics, although it was probably 15 years ago (well after I’d seen the documentary) and I honestly did find myself rolling my eyes at a lot of it; his visual style is and has always been wonderful, but the targets of his satire are almost painfully obvious (stuck up 1950s white people!!! Dumbasses he walks past on the street!), the kind of thing that blows you away in high school and makes you think you’re getting a real window into the past or something, but which you don’t have much use for as an adult. His sex fantasies are less offensive than they are mostly just tiresome–the butt/thick-leg fetish in particular grows very old very, VERY quickly and he indulges in it seemingly whenever possible. I honestly don’t think the uptight feminist woman in the documentary is really wrongheaded to say that he was just looking for an excuse to spit out pornography, and the director, Zwigoff, was right to pick someone who wasn’t stupid. Crumb’s counterargument (“hey, I watched GoodFellas last night!”) comes across as very dodging and lame, too.
Ultimately, the documentary is about how his artistic talents made him the best version of himself that he could have been, given the circumstances, so I guess the documentary makes me root for him in a way his comics wouldn’t.

Crumb’s wife died some time ago, IIRC, and I wanted to draw an analogy between him and his two brothers dying as being like Carl and Dennis Wilson dying while Brian somehow stays alive, but that’s not a very good analogy.
The Criterion DVD has a decent booklet essay, an unnecessary second commentary track from Zwigoff (the original was Zwigoff talking with Ebert, and is still there), and a few decent deleted scenes, one very funny one involves Crumb taking out a gigantic stack of various weird and dirty magazines that he uses to draw from, and another one where he talks about how he and his first wife were both virgins when they got married and that she tried to prevent him from leaving her by putting sleeping pills in his dinner and sitting on his face.