Extra modes
Go to the screen with "Start" and a picture of the car. Hold B + L, then press Down until a chime is heard. All three extra modes will not be unlocked.
All tracks
Go to the screen with "Start" and a picture of the car. Hold B + L, then press Right until a chime is heard.
All cars
Go to the screen with "Start" and a picture of the car. Hold B + L, then press Left until a chime is heard.
All tune ups
Go to the screen with "Start" and a picture of the car. Hold B + L, then press Up until a chime is heard.
View credits
Go to the screen with "Start" and a picture of the car. Hold B + L, then press Up + B to view the ending credits.