Quick resume
During a race, press L1 + R1 if you go off-track or crash to quickly resume the race

Expert mode
Select pro-career mode, then enter "ALLOUTAI" as a name. If you entered the code correctly, the game will return to the name entry screen.

1000cc Quad ATV
Successfully complete pro-career mode.

All Tracks and Bikes
When Playing the game pause the game and push L1,L1,L1,R1,R1,R1,X the screen should wiggle.