I don't think they did anything radically different schemewise. They had some badass defenders especially that MLB who seemed to make every tackle, most behind the LOS. Also, iirc, we sustained some critical injuries on O that game.
I keep remembering bits and pieces from that game. The game's outcome really turned on a handful of plays. We had a td called back on a phantom penalty, that was huge. We also gave up a couple of deep balls that hurt us badly. They were mostly amazing catches by that freak ND receiver, not so much bad D.