The book is heavily 'footnoted'. [=the book includes many footnotes]
a movement now regarded as a 'footnote' to history
(..) an uncatchable woman... ...is to offer her a wedding ring. What, a father's not allowed to talk about his son? I'm a footnote in that story, Dad... ...the context for your great adventure, which never happened, incidentally. You were selling novelty products in Wichita when I was born. (..)2003 Big Fish