If you go to championship and when you see an arrow on the track to skip the arrow and go right through it you can just hold the A, R,and L button you will go right through it. It's really cool you should try it you can also put tape on all of those buttons and you can just race the whole dang race with out hitting any arrows it's really cool.
GameCube
Float hint
If you hold in A,R,L, and B you will just lift off the ground