THE REFEREE CANNOT REVERSE A DECISION AFTER THE GAME HAS ENDED

Question:
Goal is scored in the closing seconds of the game. Referee sets up with a restart and blows the whistle for the match ending. As a referee exits the field the losing coach complains that that goal was scored after time had run out. The referee confers with this ARs and decide that he did play more than the allotted time.

Question is once a referee signals the end of the game, can he change facts.

Answer (March 30, 2014)
No, the referee cannot change the facts of the Game or his decisions once the game has been terminated (declared over). Law 5 is quite clear on this matter. Under Decisions of the Referee, the Law states:
The referee may only change a decision on realising that it is incorrect or, at his discretion, on the advice of an assistant referee or the fourth official, provided that he has not restarted play or terminated the match.