Over three decades one indispensable item in my pack is a notebook. I would certainly recommend photographers do record exposures when trying something unfamiliar. Each and every exposure is recorded (frame #, mode, Tv, Av, filter, if any, lens, mirror lockup/delay, lighting conditions etc., and for star trails, all details of intervalometer settings) and when the film comes back, the record is removed from notes and inserted into a clearfile sleeve for instant reference back to every exposure. It is an automatic action for me to go from camera to notebook after each exposure, irrespective of whether I'm using 35mm or 120 pinhole. I do not record digital images as these carry their own information in EXIF form for reference.
The iPhone has a voice recorder and is useful for taking notes. We have Doctors to be thankful for the advent of voice recorders from way back: they will not go anywhere without a "corder" (my own Specialist in Nephrology has one in brushed mauve/silver that doubles as bling!).
Some 35mm and MF cameras imprint exposure data in the film rebate, but I have long forgotten which cameras do this. Is it the Contact RT??