Ok, this is going to sound like sacrilege, but I’ve taken to jotting down all my custom settings on the GF’s glass top with a dry erase marker. If you’ve seen A Beautiful Mind you know what I’m talking about.
As I zero in on custom settings, I make lots of finicky changes and was forever forgetting which set of notes was the most current. This way I can wipe away the value to be revised (usually with my fingertip ) and jot down the new one. Once I’m happy with a print, I record the final values in a more permanent form.
For production jobs, I also note alignments and any procedural notes that I’m likely to forget before each run.