ldct
Section links in footnotes are broken.
The subsections don't even include numbers in this version, so you can't find the reference they're talking about by a text search either. The original book has numbers on the headings and there are many references to them throughout the text, not just the footnotes. These other internal references should also be hypertext to the appropriate chapter and heading.
I've added the subsection numbers in my fork. I'll probably have the links working soon.
Some of the section numbers are written as x-x-x instead of x.x.x in the original. The Exercise references are also broken. This could take a while.
I made a pull request for the section links. I haven't attempted to fix the Exercise links.