I have some disappointments with the Barcelona players in this match. Barcelona should have won, but Yamal gave Dani Olmo several chances, but he couldn't finish them. Two good chances came his way, but Olmo seemed too hasty, shooting wide.
Further disappointment, I criticize the defense for being too ambitious, wanting to help the attack score while neglecting their own defense. Barcelona defenders often gave Rayo players chances, which almost resulted in goals. Hansi Flick must correct this performance.
I've looked at the statistics for this match & Rayo Vallecano dominated the attack. Both Barcelona & Rayo Vallecano had the same number of shot attempts, but Rayo Vallecano had the most shots on goal (6 shots on goal). I don't know why Rayo Vallecano could play so aggressively, maybe playing at home boosted the morale of the Vallecano players.
With this result, we only have 2 teams remaining in La Liga with perfect runs, they're Real Madrid & Athletic Bilbao. I hope Real Madrid maintains their consistent good results so they can secure La Liga title this season.