alt Hacker NewsI had a similar experience with a second-hand copy of House of Leaves [0].
This was a special treat because the book itself already uses copious footnotes and cross-references from fictional characters to create a maze. And now a real person added to the effect by trying to make sense of it themselves.
You obviously need to add your own footnotes trying to make sense of those footnotes, then anonymously donate it to a used bookstore.