I didn't hear what Klopp said to Keane about "sloppy" but he was absolutely correct.
That was a magnificent performance.
The pace, the relentless pressing, the passing, etc.
But the thing I like as much as anything is how few free kicks they give away. If they're not on the right side of the opponent--and they usually are--they're harrying them, relentlessly, in packs, and all without putting a foot wrong.
(Aubemeyang at the end there, gets the ball in a good position, but before he can decide what he's going to do there're 3 players there, surrounding him, forcing him to make a mistake. 92nd minute.)
Not to say they don't foul, but they rarely foul where they shouldn't.
It's a discipline that not many teams have, and no teams that play at the pace at which they play.