In the middle of the Man Utd games we also played Reading twice in FAC round 2. First game at their place and replay at Manor on Wed immediately after the first game. Oh .... and there were also 5 league games in Dec as well, incl Boxing Day v Bristol Rovers (3-2 Kevin Brock winner) followed NEXT DAY, 27th away at Bolton. 4 days later Orient at home (5-2) .... then only two days later 2nd Jan, a trip to Devon to play Exeter (by this time the team was well and truly knackered and lost 1-3).
As we had beaten Reading we then had a 3rd round FAC game v Burnley a few days later. It really was non-stop that season, which as you say Klopp, Guardiola would be going bonkers at.