Unlock everything:
Press Up, Right, Down, Left, Up, Left, Down, Right, Up, Down, Up, Down

Camera options:
Win all Challenge Cup events to unlock the "Flipped-cam", "Mashed-cam", "Oz-cam", and "Retro-cam" options at the "Bonus Features" menu.

Quick start:
Press X on the on the fourth beep during the pre-race countdown.