Bobble Heads
When you unlock a bobble head doll, go to the bobble head case and select one of the dolls. Use the left analogue stick to rotate the doll, and the right analogue stick to flick its head.

Unlock Air Hockey in the Crib
Win the Super Bowl to unlock the Air Hockey in the crib.

Unlock Big Head Mode
Create a custom player to unlock Big Head mode.

Unlock Kickin' or Stickin' Cheat
Play the game continuously for three hours using one username to unlock this cheat.

Unlock Paper Football Game
Complete one complete game in First Person Mode to unlock the Paper Football game.

Go to: ESPN NFL Football Info Page | nGaming Home Page.