He describes in some later edition how he typeset the book himself which is in itself a towering achievement (with him not being a typesetter and all).
Hofstadter cares a lot about form, and thinks it is intimately connected to function. I believe in the end of "I Am a Strange Loop" he said that he edits every single line of text so it fits evenly and aesthetically across the line. In other words, each line must stretch to the far right of the page, but the letters can't be stretched out/separated too much. This must be extremely tedious to accomplish.