I watched only the first half. United played the same type of boring football we witnessed for the most part of last season. Liverpool clearly dominated as they saw more of the ball, engaged in build-up play and were preasing high up the pitch once United got the ball back. All the hallmarks of Klopp's way of football.
United sat back, defended deep and were waiting for counter attack opportunities. The way small teams like Leicester or Burnley would play against a top team.
I don't know what happened in the second half, but the first one left me disgusted. It's a pre-season friendly ffs, give the youngsters some freedom to impress. But not Mourinho, NO! We gotta play shitty, defensive football even in meaningless firendlies.