I can look back at the game and point to six plays that could have changed the game if they went the other way.
Most notably, the Patriots had at least three drives end on third down dropped passes. Including, Welker on the first drive, failing to haul in a catch-able deep ball that probably could have been thrown better on Brady's part. In either case, Welker was open, but him and Brady couldn't connect. Then, there was another Welker drop on third down in which the ball was right in his hands, with no one near him. Finally, Brandon Lloyd dropped a pass on third down after stumbling on his route.
On a similar note, Shane Vereen dropped a short pass in the red zone that would have given the Patriots a first down, late in the game. Two plays later, the Pats turned the ball over on downs.
Besides the drops and drive-killers, the Patriots also committed all three turnovers in the game, two of them on fluke plays.
The first turnover came in the fourth quarter when the Pats still had a chance to win. After a couple of easy first downs and an eight-yard run by Stevan Ridley, he went head-to-head with Bernard Pollard who injured his fourth crucial Patriots player (Tom Brady, Wes Welker, Rob Gronkowski and now Ridley).
On the play, Ridley was clearly knocked unconscious and, thus, dropped the ball. The Ravens recovered and scored their final touchdown of the game on the resulting short field.
Two drives later, the Pats were in striking distance of the end zone at the 24-yard line, with the game still winnable. However, a pass, tipped at the line, soared an extra ten yards right into the hands of Ravens linebacker Ellerbe.
There is just no saying how the game would have turned out if two of the four drops were caught or one of the two turnovers didn't happen. These were the six plays that determined the game; these plays went the Ravens' way, not the Patriots.
As a result, the Ravens are playing in the Super Bowl on February 3rd, and the Patriots are watching at home.