As Jesse G., points out the most infamous refereeing blunder was the missed or ignored handball by Torsten Frings on the goal line in the 2002 QF against Germany. That was a cracking game and anyone watching it knew the Germans escaped that day. Michael Ballack scoring the only goal with the USA playing like it did today.
The referee was Hugh Dallas of Scotland. If Eric Wynalda wants to call an investigation into Koman Coulibaly, perhaps it would be better to start with Mr Dallas.