He did get the first two big decision wrong, but I do have sympathy with him with both. The penalty didn't look like a penalty to me on first viewing - it was only on seeing the replay, from a much better angle, that it becomes a clear penalty. And the Dier challenge, I couldn't call it live as to whether he won the ball or not. I was 50-50. Again, I needed a replay.
I think the referee's initial though with the Dier challenge was that it was probably a foul. But when he realised it would have meant a red card, he changed his mind. Had it been someone not already on a yellow, I suspect he would have proceeded to give the foul and yellow card. But to send someone off, you really need to be certain. And I can understand why he wasn't certain there.