I read the match report on the BBC Sport website and was going to ask you whether you could tell, sat in the stands, that the referee had sent off the wrong player, although if the two players in question are of different races then I'm guessing the answer is yes.
I had a look to try to find what happened to the referee who incorrectly sent off Gareth McAuley against Manchester City in 2015, instead of Craig Dawson, but I couldn't find anything. I'm assuming that the referee, and possibly his assistants as well, will not be given a game to officiate next weekend.