1: I appreciate the desire to decrease usage of paper and ink, but for those of us with eyes that aren't so great anymore, an option to increase the font size wouldn't hurt.
2: The TOC seems to have a lot of unneeded white space. It seems likely that decreasing the leading a bit would save a whole page in this case.
3: I miss the page numbers on hardcopy.
4: An option to omit the Notes, References, and/or External Links would save 6-7 pages. They are nice, but if I really need them, I know where to find them online.
5: Extra nerdy suggestion: given that this is hardcopy, a little QR code for the URL would be a nice way to link back to the online document. Especially in cases like this example, where the URL includes an "oldid" parameter.
Overall it looks great—clean and modern!