NFL referees have the responsibility to not only help create a good product on the field, but to also take in the criticism from the general public week in and week out. Being an NFL referee isn't easy. The game on the field moves so much faster than what you see on television. Referees before a play have to monitor illegal procedures on offense, how many men are on the field and offside penalties on defense to name a few.
Then, after the ball is snapped, referees have to watch for holding on offense and defense, clipping, tripping, illegal man down field, illegal forward pass, intentional grounding, hands to the face, facemask, personal fouls, helmet to helmet contact, pass interference, and illegal contact .