I thought this world cup did really show how many mistakes are made at all levels of the refereeing. Some sports games now use video playback or as with cricket, a 3rd umpire who reviews the video and gives the other umpires his view if they ask for his opinion.

Goals being given not deserved? Penalties not deserved? Players sent off not deserved? In all cases, video playback showed how poor the referee decisions were. The referees were very quick to make a decision without even seeking advice from the linesmen about what they saw from their angle. After all that is one of the reasons for the linesmen AFAIK.