Yesterday's 3-3 draw saw Liverpool come from behind twice - before a 94th minute 'offside' goal allowed Watford to take a share of the points.
The Liverpool boss Jurgen Klopp expressed disappointment that the reds were not up to the physical challenge in the first half but highlighted the attacking play in the second half.
And he said that the reds would improve from their opening day stumble.
Klopp told the press:
'We have a lot of things we can work on. I saw a lot of good things, but now we have to prepare for the next game.
'If you do everything perfect on the first match day then that makes no sense.
'We will try to work on it, of course. Everything is different in a league game than a pre-season game, of course.
'We scored two wonderful goals in the second half, we had our moments and then we conceded an offside goal. That's really not fun.
'It's difficult to accept but we have to. It happened last season very often, it feels not too good.
'But we know we can do better and have to do better.'