Some random thoughts.
Davies keeps making stupid errors and it's because he's no longer playing on instinct and he's thinking through everything, which means the pass has gone or he's took a heavy touch etc. That said, there is a player there, but he needs to calm down.
First half was dire all around. Only Digne, Zouma and Richarlison looked like footballers for most of it.
The penalty - I was directly behind it looking from the Park End. For me, it looked like a cynical shove to divert the player away from goal, so it's a penalty. I haven't seen it back though.
Second half was like a different team, particularly when the completely ineffective Calvert-Lewin went off for Tosun. Tosun is a proper striker; DCL simply isn't at the moment. He needs taking out of the first team for a while and time to reflect, hopefully on loan in January.
Man of the match for me was Richarlison. Excellent throughout. As said above, Digna and Zouma also good throughout and Sigurdsson good second half, but over the full 90 it was Richarlison for me; the difference he makes to our side is massive.