Dirrell 'slipped' twice. Froch hit behind the head on more than a dozen occasions. It's fair to say that Dirrell threw the fight away rather than Froch won it. You are correct though, if Dirrell brought his fighter's head on, it wouldn't have even been close.
114-113 Dirrell Ridiculous point off for holding, whereas Froch should have had a few points taken off for rabbit punching were the fight on neutral turf.
What's funny is the amount of people who think that Dirrell won it so clearly but when you look at their scorecards, they are all different. On memory Froch took round 2, 3, 5, 6, 7, 8. I'd have to dig up old posts to see my exact card