Taking a picture (even of the floor) for a time stamp is a great tip that I forgot to mention. Also I know that some shoppers put their cell on videotape and do a quick scan, with it held casually against their chest or handbag, so that they capture an image of the cashier. Helps if you have trouble remembering descriptions. For the life of me I couldn't register if cashiers wear glasses or not for about the first six months until I made myself repeat this over and over to myself while standing in line!
I learned a police method from the Internet of scanning people for descriptions in the same way each time, top down: gender, height, hair, glasses, eye color, build...etc. I try to use a mnemonic to remember name tags (Barbara with Black hair has Big glasses...). If you are recording, you can greet them. You can say, "What a great shade of green in your blouse," etc.
I dictate quick notes to myself after I leave, and you can even just text this to yourself. Sometimes a notebook (always close it if it's on your front seat, store employees do sometimes see them in cars) is the easiest and fastest and most reliable way to keep track.
I use Google Maps throughout the day to track my routes. Helps a ton as backup if I forget when I entered a certain store, or need to match my notes to a location when my recordkeeping is less than clear. You can go back and see what time you entered and exited each parking lot.
Hope this helps. I'm pretty much done with shopping and doing my best to share everything that I learned in a year of intensive effort and about $28,000 in gross income (much less after real expenses).
Doing my best, every day
Edited 2 time(s). Last edit at 04/15/2019 12:25PM by Shoshi99.