Win the Backyard Bowl to unlock the Humongo Dome.
Win the Backyard Bowl to unlock the The Castle.
Get five sacks in a game with one player to unlock Jason Taylor.
Get five rushing TDs in a game with one player to unlock Larry Johnson.
Throw five TD passes in a game with one player to unlock Vince Young.
While on defense, if the offense throws a far ball, become the defender that is guarding the receiver. Push or run into the receiver, and it will result in an incomplete pass.
While on defense, if your player and the offensive player with the ball are charging each other, press C at the correct moment, and he will fumble the ball. Note: This rarely happens.