Cheats Menu
Enter: L, C-Up, C-Up, C-Down, C-Up, C-Down at the main menu.
(Thanks to kitsumon_@hotmail.com)

Tricks
Hold the R button for the following tricks:
Backflip: Up C-Left
Can Can: A
Cliffhanger: Right/Left A
Fender grab: C-Left
Nac Nac: Z
No hands: Right/Left Z
No hands, no feet: Down Z
One foot Can Can: B
Recliner: Down A
Rodeo: C-Down
Scorpion : UP A
Side prone: Up Z
Super Mac: Right/Left B
Suran wrap: Down C-Down
Surfer: Down B
Toe clip: Up C-Down
(Thanks to kitsumon_@hotmail.com)