The referee's call that disallowed team USA's third goal is not his genuine mistake. He just wanted to rob team USA. There is no way, no chance and no angle to see the U.S. player offside. The game otherwise would be a classic of victory from coming back in U.S. soccer history.
The worst referee call, I think, should be those calls that referees saw the play, but still decided to make call or non-call, i.e. make a bad call. And this bad call changed the result of the game. I understand that sometimes referees truly didn't see the play and therefore make wrong calls.
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