O was at least in part trying to put on a show. Remember Cutcliffe's biggest critics always bemoaned his lack of enthusiasm. Well, O figured that was one of the first things that he could fix.
Mullen on the other hand is just coaching the way he knows how. I don't think he's trying to impress anyone. I think he's just trying to teach our players to be the best they can be and try to win as many games as he can. Also, notice that when Mullen is yelling at the players, he's teaching them what they should and shouldn't do. He's probably pissed because they're screwing up stuff that they shouldn't- like throwing a well-timed pass on a slant.
Mullen on the other hand is just coaching the way he knows how. I don't think he's trying to impress anyone. I think he's just trying to teach our players to be the best they can be and try to win as many games as he can. Also, notice that when Mullen is yelling at the players, he's teaching them what they should and shouldn't do. He's probably pissed because they're screwing up stuff that they shouldn't- like throwing a well-timed pass on a slant.