I'd love to know. St. Etienne, Barcelona and a couple derbies in the 70s were way over capacity for sure. There's probably a lot more examples people will remember too.
I can think of two others. Both 'title deciders'. Leeds Utd, Easter 1973. Ipswich Town April 1977. I was in the Annie Road for the first and on the Kop for the second. Both terraces were rammed. The Ipswich game in particular was severely full. I was one of the last on because I'd been waiting - in vain - by the flagpole to see if my mate got in who I'd had got separated from in the crush on Kemlyn road. He remained outside, along with about 25,000 others. When I entered the ground from under 'The Pulpit', the gangway was packed - no way through. I started to push my way down on to the lower half of the terrace and an angry bloke pushed me back with a "No chance". There was a real resistance from people there to let anyone through. I got nowhere near my usual spec and pretty much stayed where I was on the wings. But it was packed there too. I spent the next hour from 2 to 3 in a constant surge, back and forth, as people pushed their way in and out of the terrace. Absolutely knackering to be doing that for so long (it settled down, as it always did, during the match when the surges became much more predictable - near misses, corners etc).
I've still got the match programme from the next home game and the attendance, unusually, is sort of 'written' in rather than typed in the usual way. It's 56,007. A bloody joke.
That was the last season of 56,000s. When we came back in August they'd put fences up at the front of the Kop, added more crush barriers, built bulky wooden boxes around the pillars to stop people climbing into the roof and reduced the capacity from 28,000 (on the Kop) to 24,000. It was packed in the 80s on occasions, but it was never that packed again.
The
sound of that 1977 title decider remains with me to this day. The ref had a lot to do with it of course. Never heard a crowd so ferocious again.