For me one of the most memorable scenes in "Jimi Plays Berkeley" has always been the finale where Jimi is playing on his knees for two young girls at the edge of the stage. While both of the girls are enjoying it, the girl on the left is nervously overcome and keeps looking away at her friend. The girl on the right, however is just soaking it all in and never shifts her gaze from Jimi. In the film they look like they're both very young, maybe 14 or 15.
I've always wondered who they are, where are they now, and do they even know they're in the movie?
Same goes for any of the other colorful characters in the film - the redneck, the "Boycott Woodstock, we made this movie!" girl, etc. Wish I could think of a way to track them down and interview them.