Alternative credits
At the credits screen Hold L1 + L2 + R1 + R2+ Square + Circle to change the names to those from demo mode.

Bonus credits message
On the high score screen, enter SH4 as a name. Now a bonus message will scroll on the credits screen.

Cheat Codes
Enter the following codes under the options menu.

Code What It Does
LASTCODE All Cars And Tracks
FRAGTIME Division 1 & 2 Cars And Tracks
TURBOMOS Nolby Hills Track
INSANITY Alternate Demo
SOFTHEAD Faster View
SUPERCAR Overhead View
NOCHEATS Disable All Cheats