Explode all other cars:
To explode every other car in the race but yours hold L and R while pressing ,white ,x,x,x,y,x at the pause screen
Unlock all cars and all tracks:
At the main menu hold L and R while pressing white,black,left,right,y,y,x do this carefully and then you will have unlocked everything
Quick start:
Press A on the on the fourth beep during the pre-race countdown.
Bonus features menu:
Flipped-cam Beat every Challenge Cup event.
Mashed-cam Beat every Challenge Cup event.
Oz-cam Beat every Challenge Cup event.
Retro-cam Beat every Challenge Cup event.