Unlock All Story Events:
On the password screen, enter: GOLDKEY
Unlock McQueen Custom Kits:
On the password screen, enter: GR8MODS
Unlock All Arcade Events:
Type SLVRKEY to unlock arcade mode events.
Unlock Paint Schemes for Everyone:
On the password screen, enter: CARSHOW
Unlock McQueen Friends:
On the password screen, enter: EVRYBDY