It was poor that he missed the corner, but when all said and done, he simply didn't see the ball hit the defender. It happens. Oliver didn't see Ederson's touch the other week, and we almost had a goal from the incorrect goal kick.
Dias was penalised for a high boot, which was near the guy's head, so that's a fair decision also - dangerous play.
I thought the foul by Gundo was harsh, but every team gets those now and again. Thankfully, we defended well and got the win we deserved.
My main concern is that referees do not punish dissent and foul and abusive rants, as they are required to by the LOTG. But this guy isn't alone in that, and it's not really up to him to set the tone for this sort of thing.
There's definitely room for improvement, but for a referee new to the PL, I thought he was OK.