1) I have, in the past, read numerous references to this mother, whom I know he was in touch with over the years; don't recall about his father, but will have to consult the Howard Sounes bio, which is very good.
2)National Lampoon did a Zimmerman comics years ago, a hilarious send off of Dylan's life; don't know if anybody remembers it -
3)As for Dylan's persona in those films: yes, maybe the interviewers were clueless idiots, but I've always found the Dylan persona of that era to be quite narcissistic/repulsive; he was a complete a-hole, arrogant in a way which detracts from more than a little bit of the music - I was struck during the documentary with how sloppy and lazy a lot of his writing is on songs like Desolation Row - forced rhymes, pseuo-symbolist references, things clearly dashed off by someone who was writing too much, too fast in those days; in my forthocming rock and roll history (self plug) I make the point that I think it's somewhat ironic that, for all our consideration of Dylan the poet, his greatest contribution seems to be musical, in his formulation of the group folk/rock sound, his very smart melodicism and, surprise surprise, in his vocal time and phrasing, whic are absolutely masterful in the 1960s - the arrogance of his lyrics really hurts longs like "Like a Rolling Stone" POsitively Fourth Street" Don't Think Twice", reducing them to personal revenge and re-dress instead of musical poetry. Just my opinion -