There were two calls last night that I was not sure I understood. First, about half way through the second half, I thought I heard the ref blow a whistle for a foul (I was in the upper level above the north side goal, so I was a good ways from the whistle), and then when the players did not stop, signaled for advantage. I could not tell for certain whether the whistle was the ref's or not, but it looked as if the players decided not to stop and the referee decided to just let them go ahead. The second was the retake to the late US PK. The Nigerian keeper encroached about 3 yards on the first take, but the US scored. The referee then ordered a retake. The Keeper encroached as much again, but the goal was allowed to stand. Both ARs used a technique I have not seen...they would raise the flag in their right hand to signal ball out of touch, and then signal direction, sometimes shifting the flag to the other hand if the direction was left. It looked a bit awkward to my eyes, especially when compared to the crew at the earlier N. Korea/Sweden game, who did it the way I have been taught, immediately signaling direction.