It could have been a different story had Mane’s effort being allowed to stand, but the Liverpool attacker was flagged for offside when he tapped in the rebound from Roberto Firmino’s shot which had hit the post.
Mane was in an onside position when Firmino shot, but offside when Trent Arnold-Alexander had played the ball to Firmino.
Klopp said: “I think it was a goal, it should have been a goal.
“When I was a player the offside rule was different. The ball is going and one player is offside and the referee doesn’t whistle so he runs to the ball because he doesn’t think he is offside and then the referee whistles.
“It was a brilliant attack, it’s what you do on the training ground, leave one player in between the centre-halves, slightly offside but the other takes the ball.
“It’s a pity that it didn’t count, we made a few more mistakes tonight than the ref, but it would have been nice if that goal counted.”
Klopp conceded it was an “intense” encounter but declared it a good result.
“It was very intense, Arsenal are in a very good moment, I thought we made life a bit too easy for them,” the German added.
“A point at Arsenal will always be an absolutely good result, so we take that and move on.
“It was always difficult against Arsenal [before today], it was very spectacular, today was no less spectacular just with less goals than last season. I knew before it would be difficult.”
Gunners manager Unai Emery, celebrating his 47th birthday, was also content with the performance and even happier that his side improved on their previous displays against the top teams.
“The result is a good result for how we did in 90 minutes, when we were losing,” he said.
“We deserved it because we could have lost, but we could also have won in the 90 minutes.
“It was a good test for us. We need more, in our work and tactically also.
“But the spirit is like we want. The progress takes time, a long time in football is very difficult to demand. In the three matches (Liverpool, Manchester City and Chelsea), this was a more complete game for us.
“It’s very important when you play against City, Chelsea, Liverpool and if you win it’s better.
“But the other games are important also. Today is one test, how we are against a team like Chelsea.
“Maybe today we are more near those teams. But we need this quality in every match. Every game is important like today.”