1)  I don’t know, maybe CONAN? There are big swaths of CONAN that I’ve never read. Tough to find anything similar among the core super hero titles, though.

2) It’s mainly just forgetting stuff that’s happened over the years. I’m actually better at the first twenty years or so of Marvel history than I am at the period during which I’ve worked at Marvel, because while I’ve read all of the stories during that period, they don’t tend to stick as well as the stuff I read when I was younger (and there’s an awful lot of it.)