Unlock all tracks
At the name entry screen you can enter GOOZ as a name to unlock every track.
Unlock every championship
Enter the Championship Mode and enter CARNAGE as your name.
Unlock regular Le Mans cars
Enter the Championship Mode and enter MONSTA as your name to unlock all the regular cars.
Enter any of the following as a name:
Alternate Replay View
Press Y during a replay to cycle through various views.
Full Pause Screen
Pause the game and press X + Y.