Get All Cameos
     Go  to  the  features at the main menu, then to Create-a-Car. Now
enter the following: Seymore Cameos

Get Dale Earnhardt Bonus
     Win  Daytona 500 in the season mode using Kevin Harvick's #29 car
and a bunch of others.

Unlock All-Star Race
     Reach level 16.

Unlock Bud Shootout
     Reach level 18 to unlock this.