Dominik Szoboszlai's free-kick in the first half put Liverpool ahead but the points would be shared after Richarlison struck in the 90th minute.
Slot said afterwards: "In the large parts of the game that we were the better team, I think that is a moment where you have to score the second. I think we had moments to do so quite a lot and in the part of the game where it was more equal – the last 15 to 20 minutes – on both sides, it was waiting for one of the two teams to score.
"They created the chances all in a similar way, the four or five moments they had: long ball, picking up the second ball and then try to be a threat in moments like that.
"We also picked up a lot of those second balls where we were able to counter-attack them, but from all these counter-attacks, all these four versus three, three versus two, all these moments that I felt with the quality players we have that we should be able to either get a bigger chance or when we have it, to score it, we didn't and then in the last minute we conceded the equaliser and then there's not a lot of time left to make up for it."
Asked if the result damages Liverpool's top four hopes, Slot was clear: "Of course it's damaging, but it's how many times this has been damaging for us. We don't help ourselves at all. It's so many times this season that we've created much more xG or chances than the amount of goals we score.
"I think it's understandable for fans to be frustrated because it happened already so many times that they've seen the home team not picking up the points that they're expecting to, us conceding goals in the last minute."