Pre-Prem, I worked with a guy who could run the line in the top two divisions and ref lower league games - ran the line in those legendary Everton/Sheff Weds FA Cup games - late 80s. He ran the line in a Manure/AC Milan friendly - Gullit and co. Expenses only in those days and you weren't allowed to ref games in your local area. Was forever telling us that the assessor in the stand reviewed the ref's performance with the ref in attendance using video - mistakes were highlighted loud and clear. I don't think that direct analysis of performance happens these days.