EA Bio Extras:
Reach Level 16 to unlock the All-Star Race. Reach Level 18 to unlock the Bud Shootout.
Unlock All Cameos:
Select the Features option on the main menu, then Create-a-Car. Enter the name Seymore Cameos as printed.
Unlock Paint Skins:
To unlock paint skins, set the game level on Veteran or Legend and then race on any 1 player race. This will not work on 2 player races.