Trent Alexander-Arnold thumped home the opener after a well-worked free-kick that involved Mohamed Salah rolling the ball into the path of the young defender.
The Reds extended their advantage when Alexander-Arnold played a similar pass to Andy Robertson before his cross was met by Roberto Firmino's header.
"It's of course from the training ground, the Robbo (Robertson) one is from the training ground," said Klopp.
“The Trent one, I really see the boys on the pitch today had the best view on the pitch. It's their job to see the best opportunity to score.
“It was a direct free-kick so could have scored directly, but this little move changed the whole angle and made it pretty impossible for Kepa (Arrizabalaga) to make a save. It was a brilliant goal.
“Pete Krawietz and our analysts, they do a really good job around set-pieces, especially corner kicks.
“I loved the corners in the second half where we probably should have scored twice. But it wasn't a set-piece game, we played a lot of good stuff and in the end you have to score and that's what we did. All good."