Similarities, influences?

I told KC that "Confederacy of Dunces" reminded me of something I'd read before and finally made the connection. It's a great, absurd play called "Oh Dad, Poor Dad, Mama's Hung You in the Closet and I'm Feelin' So Sad." The protagonist, Madame Rosepettle, is a lot like Ignatius: Distorted worldview, sexually repressed and delivers snappy, pseudointellectual dialogue.

I don't know whether it's something the author would have seen (the play debuted in the early '60s), but it occurs to me now that there's a similar, sort of Oedipal strain: Ignatius depends on his mother and becomes frightened when she gains friends, then a suitor; Madame Rosepettle depends on her son and becomes threatened when he gains a friend and suitor.

But the play also has a dangerous Venus flytrap.

Anyway, I don't know whether anyone read into any other possible cultural influences, besides the book of philosophy kc was looking into.