Infinite creation points 
Create a player, then go to "Edit Player" at the roster screen. Press Up or Down to choose the player you want to edit. Press Right to get to the speed category. Press X, then press X again.

Touchdown celebrations 
Hold one of the following button combinations immediately after scoring a touchdown to perform the corresponding touchdown celebration:

Hip thrust 
Hold L1 + Square

Jump spike 
Hold L1 + Circle.

Say a prayer 
Hold L1 + Triangle.

Spike football 
Hold L1 + X.

Shoulder shake 
Hold L1 + R1.

Slam dunk 
Hold L1 + R2.