All cameo FMV sequences:
Select "Features" at the main menu, then select "Create-a-Car". Enter Seymore Cameos as a case-sensitive name.

Dale Earnhardt:
To unlock Dale Earnhardt, win the Daytona 500 as Kevin Harvick (29 car). After winning the Daytona 500, a Thunder Plate will appear with Dale Earnhardt on it.

Unlock All Fantasy Drivers: 
Go to create a car and put in for your first name as extra and your last name as drivers. 

Dale Earnhardt Bonus: 
Win the Daytona 500 in season mode driving Kevin Harvick's #29 car to unlock Dale Earnhardt. You will also get the Goodwrench car, Goodwrench Plus car, Wrangler car, Silver car, Coke car, Bass Pro Shops car, Oreo car, and the Legacy car. 

EA Bio Extras: 
Reach Level 16 to unlock the All-Star Race. Reach Level 18 to unlock the Bud Shootout. 

Unlock Kitt Paint: 
To unlock Kitt Paint, win the Winston Cup in Career Mode. 

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. 

Unlock All Create-a-Car Sponsors: 
To unlock all create-a-car sponsors, win the Winston Cup in Career Mode and you'll get a thunder plate that states all create-a-car sponsors are unlocked.

All Star race:
Reach level 16 in your EA Bio. 

Bud Shootout:
Reach level 18 in your EA Bio.