Kinetica

Win any race in the Orbital Junction II track.

To unlock an FMV sequence about the "Kinetica History", unlock every course and character in the game.

Suicide Slide track
Finish in first place in all races in season 1 to unlock the Suicide Slide track in single race mode.

Press Circle at the character selection screen to be that racer's clone.

When going off a jump, press Select. The game will quickly put you to where you were suppose to land. This can save time and can help you pass people in close situations.

Press Up + Gas as soon as "Go" appears.

Successfully complete any one of the seasons To see your racer's face. The racer's clone also has his/her own face.