I, too, just finished Special When Lit. I agree with everyone above that the lack of narrative really makes it feel scattershot and not very coherent. I would have preferred a more in depth look at pinball creation and why the hell it was banned.
Between that and the Rock-A Fire Explosion doc, I've found that I am really fascinated by people with singular obsessions about super niche things. I admire them for their dedication and their pure love for something. I feel sad because it seems to come to control these people.