2002 world cup vs spain.
Egyptian Referee. Disallowed 2 goals.
There was also controversy in the Italy game too. The referee also later got suspended for other incidents. http://answers.yahoo.com/question/index?qid=20060624162255AAEx7cY
The refereeing in that world cup was a shambles. FIFA decided referees panel should be multinational, and as such a bunch of below par referees were promoted.