That game was a mirror of the Cowboys season: dominant early, hit adversity at the midpoint of the season, make a play and hold the fort to extend their lead, give up some plays and fall asleep on an onside kick, and then hang on due to some good fortune.
Think of the season - they start off with a flash, and people speak of them going 16-0 (ESPN's Monday Night show had the discussion), stumble near the midpoint against the 49ers, steady the ship against the Raiders and Chiefs, fall asleep in losing to the Commanders and the Eagles, and get lucky to beat the Giants at home, and have SF lose to Atlanta to give them home field advantage. They also avoid SF in the playoffs thanks to Green Bay beating them, and since the owned the Packers, they made the Super Bowl.