Thanksgiving Marge		BBXX

Christmas Apu			BBXB

New Year Krusty			BBXY

Halloween Bart			BBXA

Helicopter camera		XXXY

More camera views		BBBB

Atomic bus				BBYA 

Wireframe objects		BBAA

Smithers in Burns Car	BBYY

Soap-Box mini car		BBYX

Cardboard characters	XXXX 

Horizontal split screen	YYYY

Nighttime mode			AAAA

Halloween Horrors:
Set your Game Cube's internal clock to October 31 to unlock Bart in a Frankenstein costume.

Happy New Year:
Set your Game Cube's internal clock to January 1 to unlock Krusty in a tuxedo.

Thanksgiving Mode:
Set your Game Cube's internal clock to 3rd Thursday in November (Thanksgiving) to unlock Marge in a new doo.

Merry Xmas:
Set your Game Cube's internal clock to December 25 to unlock Apu in a Santa costume.

Hidden Car:
Beat all 10 Missions in mission mode to open "Homer: The Car Built For The Average Man" Just Click on Homer's picture in the car selection screen.

Thanks to Revolution readers Dylan, Garrett, Kevinator, and Dave!