I agree with GrizBacker in the sense that it's hard to have a wrinkle like that thrown into your gameplanning as a referee. Our level of football does not have instant replay. You can study the rules, prepare yourself as best you can but I can gaurantee you the only way to really be a good ref is experience, because it's one thing to know the rules and another to implement, recognize, actually make the calls, use your judgment, etc. What if none of the guys had ever done a game with instant replay? You are the white hat, you have a guy come to you and say he got a page from upstairs before the snap to review the previous play?
I'm not saying they got it right, I don't think they did, but that is a tough spot to put a crew in and to call it incompetence is a bit harsh IMO.