David says that one thing that hurt their connection with the kids is that the frog's mouth didn't move and so David didn't have anything to focus on.
David hints around at his own gayness, once again, by saying that he was better able to focus on the guys' mascot because he was able to focus on David (the guy who dressed up as the super hero) and on his mouth, his lips, his face, his lips. . .
Funny thing is, the girls are grossed out by this, too, but nobody says anything.