Here’s the link.
Yup. Moonwalking with Einstein was brought up earlier (written well after I read Harry Lorayne’s memory books).
Your examples in that thread explain why I’ve found the Niai visually similar kanji user script so helpful. I often have to miss a review a few times before I realize I’m confusing it with a different character. Usually it’s already present in the list provided by the script, but the ability to add your own characters with that script has proven to be a godsend. I’ll add whatever character I’m conflating it with as well as a note for whatever memory trick I use to distinguish them.