At the Title screen enter the following codes to unlock the corresponding effect during the game.
Access Movie Menu:
Press R2, R2, L1, L2, L1, R1, R1, R1.
Unlock Every Board:
Press Circle, Circle, Square, Circle, Square, Square, Circle, R1.
Unlock Every Course:
Press Left, Right, Left, Right, Circle, Circle, R1, Square.
Unlock Every Skater:
Press Left, Left, Circle, Circle, L2, Square, Right, R2.
Max out Stats/Trick Level:
Press L1, Square, Left, Left, R2, Left, R1, Left.
Unlock Secret Clothes:
Press L1 + L2 + R1.
Unlock Secret Clothes B:
Press L1 + L2 + R2.