Back in those days, you couldn't get season tickets in the ends, so most of us would POTD. If we were expecting a sell out, we would queue up at least an hour before the game, but we always got in, though a few couldn't. Problem was that they used to open the gates at half time and those outside would pour in for free and squashed those of us who had paid.
I do remember some games in the early 70s when cash was tight and we had no money to get in, so had to be happy with watching the second half for free.
How times have changed