I sat next to Lyman in the line to play AC/DC at PAPA for hours this year -- it was a very slow line with so many people doing the cannon-ramp trick -- and much of the time was spent talking about the game and the rules. He was very friendly and seemed more than happy to discuss various elements of the game, strategies, and whatever else.
I of course completely blew it when I went up to play. Chatting with the designer about his game before playing his game directly in front of him has a way of messing with the nerves! (Also I have no business playing in "A" to begin with.
About the obscure tour/song rule, I've always just viewed that as a bit of crazy fan-service for the kinds of hardcore AC/DC fans who would theoretically be some of the ones playing and/or owning the game. I'm not an AC/DC super-fan or anything, but even I have decent knowledge of the order of their album releases (and therefore, theoretically, which songs were played on which tours) and I think it's really cool to have game rules that challenge your knowledge of the band's history.