The most obscure thing to me about Woodstock is that Sha Na Na played there.
This particular documentary had a number of clips I had never seen. Overall, though, I think there were a number of misconceptions about Woodstock. One was that Hendrix's performance was supposed to be great. It wasn't, IMO. Like the Isle of Wight concert, it pretty much sucked. Hendrix thought so, too, from what I can gather. In general, Woodstock was overrated. Right now, however, I'm just unhappy that Melanie has died.
To be fair, the lackluster performance at Woodstock really wasn't Hendrix's fault. That Gypsy Sun and Rainbows band temporarily put together for Woodstock just didn't make the grade, period.