I think the head ref can overturn a call of any of the other refs. It's extremely rare and usually when the error is agredious. I really think n this case they didn't want to reverse one of the most incredible plays in college football history if they could justify not making the call. Good for them. Too bad the spineless head ref in th Miami- Ohio State championship game didn't have the guts to reverse Porters stupid call.I am happy they took their time and got the call right, but I thought penalties weren't reviewable??? Someone correct me if I am wrong. I am glad of the outcome and so happy we won, but I am quite certain penalties (other than targeting) aren't reviewable...