I'd really like to see more novels published with commentary alongside (i.e. in footnotes or in some other way that makes it easy to refer to while reading), with a much broader range of topics than the one you mention (also describing the reason for slightly puzzling situations, references that have aged out, and also simply commentary). I've seen that done consistently only in the Bible, and I really liked it when I saw it in iirc a bilingual edition of Alice in the Wonderland.