I guess my background in the theater is stronger than I thought. I remember my theater course as an undergraduate and I think we went through the basics, like Ibsen's naturalism, Strindberg, Beckett, all that jazz. Albee and Ionescu came to talk in Davis when I was in school. Senior year I took graduate course on Spanish theater. I know I read Eliot's plays in high school, and Yeats. My dad had a complete set of the Greek tragedians. I re-read them in my 30s too. I've taught Lorca and Valle-Inclán, seen productions of Buero Vallejo in Spain.
I could say I haven't forgotten anything, but there's stuff I've forgotten and rushes back to me, and other things I don't even know I've forgotten, because you can't prove a negative.
I remember specific things I learned in a class in 1978. How can that even be? A specific question I had about a monologue from Godot, and what the professor said. I remember we disagreed about whether the monologue was a critique of language or not, but I can't remember which side of the debate I was on.