1. The team you called as the winner has to win.
2. Closest score will be calculated by the following:
Example: you call 30-10 Saints win.
Final score: 24-3 Saints win.
You were off by 6 points in the Saints score and 7 points for the opponent score. Making it a total of 13 points off the final score. Whoever has the lowest amount of points from the final score, wins.
Simple enough me thinks.