I think it was easier to remember players from back then because they stayed with teams for longer. Squad rotation was not a thing and most teams had a recognisable first XI. I reckon I could still have a good bash at naming the players from almost any team that was playing in the old Division 1 in the 70's from 72/73 onwards, even though its 50 years ago now. Alternatively I would struggle to name 11 players from most current PL teams. Another contributory factor which helped were football cards, which were a big thing back then.