After three straight wins sent them to the top of the table, they looked like a reborn team, with even the goalkeeper saying their change in mentality has been crazy. How far can the team travel?
The mood at the stadium was low last season when they started with three straight losses.
Two defeats in a row in their last three games allowed their neighbours to overtake them and take fourth place.
Things seem to have changed after the return of William Saliba from a loan spell in France.
Since the start of the 2004-05 season, no team has won each of their first three games in the premier league.
Martin Odegaard scored two times in the first 11 minutes of the game.
Ramsdale said that the mentality has changed from the end of last season. We're more aggressive. We knew how close we came. It took a long time to get over. It hurt more since it was the other way around.
Mikel Arteta has been in charge since December. The environment is pleasant. The unity is amazing.
Difficult experiences make you stronger and help you learn more than you know. We do not want to go through that again.
Being top after just three games doesn't mean anything according to the Spaniard.
It means that the team is playing well, we won three games, we're scoring goals, and we're keeping clean sheets.
It's all about Monday and getting better at other things.
The same team has played in all three games so far, including Brazil forward Jesus, who won four titles with Manchester City.
"Zinchenko's class seems to be infectious in this team, he is setting the standards right now," said Keown.
Three years ago, Saliba joined the Gunners, and before that he spent time at Saint-Etienne, Nice andMarseille.
Jesus has been playing out wide for City and has been a substitute in the past.
Ramsdale thinks we have the Gabby from when he was a young boy. He is trying to get all the balls. I was surprised, we knew he was a great player but the type of person he is, so happy, but he has that nasty streak that he has to win.
Glenn Murray said on the radio that it was part of the process with Arteta. It has taken a while to bring him in. Fans have stuck with him despite a lot of debate.
If the title race is a question, Jesus needs to be in top shape.
It was the outside of the club that didn't believe in the hierarchy. Everyone is on the same page.
Jamie Redknapp was very impressed with what he saw in Bournemouth.
He said they are full of confidence. There is a lot of enthusiasm about the team.
The manager was under a lot of pressure a year ago. They are not the same right now. They're strong in depth. When you can bring on players like Emile Smith Rowe, you start to wonder if they can achieve something.
For a few years, there has been a soft underside. The person looks like a car. He looked like a man after learning the game in France. An aura surrounds him.
Jesus gave them an upgrade that is beyond comprehension. They used to have their strikers walking around. He wants to be injured and challenged. The right example is given by it.
It was the first double in a top-flight game for Odegaard since he was a teenager. He said he is similar to the manager on the field.
Alan Smith said that Odegard is a leader. He's a fairly quiet person. The man leads by example.
When things are not going well, he wants the ball. On his days off, he comes in. He needs to be reminded to smile. He's so focused on doing well that he's a bit intense.