Barca had too many players not at their best.
Ronaldinho, Messi, Saviola, and Xavi all had weak games. That is most of
Barca's attack and playmaking, can't expect much when that happens.
Both Liverpool goals were preventable, first the Goalkeeper spilled a ball any novice would ah ketch. Then the back line get away, get a second chance to clear and blow it.