Not sure what you were watching. You do realize that the ball does not have to cross the line right? If just the tip of the ball is touching the goal line, it's a td. In this case, all but one foot was over the line. As far as that ref goes, he had a much poorer view. His was in game speed, real time.
It was a TD. I'm glad it was over turned because reply was used correctly in that case. I hate when the refs don't have the balls to over turn a close call and claim "not enough evidence".