If the player was onside because he jumped onside at the last second as the ball was played the lesson MUST be ignore the flag and continue playing ALWAYS. So now the schoolboy lesson play to the whistle must be right.
But how can a goal be given after a referee has blown his whistle in other circumstances. Am I the only one confused?
Lets not even consider that goal disallowed early in the season for something that happened 45 seconds earlier in the other half of the pitch.