for one, the defender who got "held" was offsides on the play, and that wasn't called.
have you ever played football or watched the linemen throughout a game? much worse holds happen on most plays, and usually only the worst holds are called. dont let a picture fool you, it only shows what is happening at that exact moment, but tells you nothing about the force. that hold was very questionable. i saw many holds by both teams throughout the game that were not called, so to call that hold on that play is why there is so much bitching about it.