The defender got his first goal for the Toffees but was left disappointed with their 3-3 draw.
The Argentine defender put his side into the lead at the Vitality Stadium, as he powered home a header from a corner.
That was his first goal for the club since signing in the summer, while also happening to be the first goal his side have scored from a set piece this season.
Mori was naturally overjoyed to open his account for the club, but says he was left with a bitter taste after his side conceded their lead twice to draw the game 3-3.
“We have to learn from these mistakes. It’s disappointing because in the first half we know we played a great game.
“They got easy goals and that’s disappointing because we needed to win this game to keep [pushing] up the table.”
The result against the Cherries was even more disappointing given how the rest of the results went in the Blues' favour.
Given both Arsenal and Tottenham Hotspur drew this weekend, a win for Everton would have taken them up to 23 points - just four points outside of the Gunners in fourth place.
Instead Liverpool took their chance to close the gap and move into sixth place, something that surely compounds their annoyance even further.
With the Champions League spots very much up for grabs this season, Roberto Martinez’s side will be hoping the 3-3 draw doesn’t harm their hopes of claiming one.