Actually, they just replayed that game on NFL Network not long ago. Not a big point, really, but Grossman and the Bears offense actually did close to nothing in that game. It was won by the defense (two TDs on turnovers) and Hester (TD on punt return). The offense managed one field goal early in the game.
Not only that, but Leinart actually (and quite easily) got the Cards into FG position to win it at the end. But in true Cards fashion, Dennis Green called for a run to the left instead of straight up the middle, putting the ball on the left hashmark for the FG attempt. The result? FG wide left by about a foot. Oh, those Cards.