Referees MUST be made accountable for their mistakes
Referee Phil Dowd made a lot of mistakes in the game with Arsenal. I always had found it ridiculous that referees could make silly mistakes and get away with it. The FA will say that these mistakes make football interesting, like the "hand of god". I say that poor referee judgements are rubbish.
In modern era, video technology can be utilised quickly to sort out disagreements. Definitely quicker and more useful to avoid players/managers/referees arguing on the pitch. Poor refereeing should go the way of dinosaur.