Its even more "fun" when you loose the ball and the ball carrier in the pile on the 1 foot line. Sometimes an alert U will give his wings a head nod or shake as the wings come in to the pile hoping someone actually saw the ball and a knee at some point. We were talking about this the other day and it is ironic that such critical elements of the game are so fundamentally subjective; close spots, measurements, these types of goal line calls...All we can do is the best we can and as has been said already, SELL your call! If coaches are where they are supposed to be they have ZERO angle to dispute a goal line call anyway..of course that wont stop them frrm disagreeing
One way to train for these situaitons is to watch as much film as you can and deliberatley focus on these finer points during games.