Have a search on twitter for a bloke called Kugan Cassius, he gets lots of interviews with everyone on the british boxing scene, especially Eddie Hearns fighters, he has a video of "shovegate" which hasnt been cut as with the sky coverage, one of frochs brothers pipes up during the head to head on the pitch and then Groves starts mouthing off to him, its genuinely quite funny.
You can tell that there is genuine animosity between them and Groves appears to have Froch rattled already, not sure wether that will work to his advantage on fight night as Froch will be twice as well prepared as he was for the first fight.