Frankenbart
Set the GameCube's date to October 31.
Marge the Pilgrim
Set the GameCube's date to November 22.
New Year's Krusty the Clown
Set the GameCube's clock to January 1.
Santa Apu
Set the GameCube's date to December 25
Hidden Car
Successfully complete all ten missions in mission mode to unlock The Homer car. The car is selectable in any mode by choosing Homer's picture at the car select screen.