I too kept a log of my errors in the 1980's, hoping to become a better C programmer. I imagined that with careful enough reflection, I would never make the same mistake twice.
I found the log many years later. Last entry: "Forgot to eat. Got sick."
and issues certificates for the Bank of the Island of San Seriffe for finding them (used to be physical checks --- I got one for an error and a minor point of improvement in his book on _Digital Typography_).
While enjoying that read, I kept thinking along the way "I wish the original TeX source of this PDF were available somewhere as I'd love to see this rendered for my high resolution display the way Knuth intended."
The 37-page paper that precedes the error log, The Errors of TeX, has been reprinted (as always, with minor corrections) as Chapter 10 of the book of collected papers titled Literate Programminghttps://cs.stanford.edu/~knuth/lp.html — Knuth has not published its .tex source, though it's not impossible to find…
Why is it that pretty much everything Knuth writes is wildly detailed but yet, somehow, deeply engaging?
Maybe I'm such a fan because of many great experiences with tex (and latex). The output is just so beautiful. And the notation (once you get used to the backslashes etc) is so clean.
But, heck, I got hooked when I studied Figure 12 of [1], as an undergraduate leafing through a math journal. At first, I thought "what's wrong with this nutcase, those "s" letters all look fine to me". Then I started to see differences. And then some looked ugly. That one in the middle, though, looked better and better, the more I studied the figure. Pretty soon, I was hooked.
1. Knuth, Donald E. “Mathematical Typography.” Bull. Amer. Math. Soc. (N.S.) 1, no. 2 (March 1979): 337–72.
I found the log many years later. Last entry: "Forgot to eat. Got sick."