Barcelona were quite bad in this game. Really poor defending.

Vallecano were quite comfortable about playing their own game against them. They even had more shots on target.
Hansi Flick must be thankful for Joan García's great performance. He prevented another goal by many saves. He is a quite good signing for now.
But after 3 weeks, the best starters are Real Madrid and Athletic Bilbao with 3 wins...
I'm sure Barcelona will have problems at the end of the season because of these two lost points. I expect there will be a very small points difference between them and Real Madrid this year. In a few weeks, the standings will be almost identical, and the difference between the two teams may be only a few points.
Both teams' goals this season should be to finish the season undefeated; any team that makes a mistake will significantly decrease their chances of winning the title

Last season, the points gap between Barcelona and Real Madrid was 88 and 84, so it is natural for fans to be a little worried when they lose points in an easy match because there is a possibility of a great rivalry between these two teams. Despite winning two weak teams in a row, Barca did not win against Vallecano in the third match. Losing two points through a draw could put the team under a lot of pressure because Real Madrid will definitely try to give their best from the start in this season. Although nothing can be predicted so quickly but if the team is not serious from the start, it is not unusual for something worse to happen later.