These become viewable in the Aztec Theater as you unlock them.

Scene	How to unlock
A Stairway to Heaven	Beat "Game Over".
Alien Invasion	Beat "Enter The Cheatrix".
Cheating	Beat "Bargain Bin".
Confronting God	Beat "Game Over".
Damn You, Reality!	Beat "Land Of Chocolate".
Find the Key Cards	Beat "Bargain Bin".
Frink's Bride	Beat "Enter The Cheatrix".
Gimme Your Ride, Jerk!	Beat "Mob Rules".
I Have Super Powers?	Beat "The Tree Hugger".
My Ears Are Pointy	Beat "Mythos Of Marge".
My Precious!	Beat "Mythos Of Marge".
Nerd Alert	Beat "Bargain Bin".
Out of a Job	Beat "The Tree Hugger".
Professor Frink?	Beat "Enter The Cheatrix".
Quimby Unbribed	Beat "Mob Rules".
Skinner Confesses	Beat "Bartman Begins".
So Long, Suckers!	Beat "Five Characters In Search Of An Author".
The Creator	Beat "Five Characters In Search Of An Author".
The Eating Contest	Beat "Around The World In 80 Bites".
The Game Manual	Beat "Bartman Begins".
The Mansion Gates	Beat "Five Characters In Search Of An Author".
The Strategy Guide	Beat "Enter The Cheatrix".
What's for Dinner?	Beat "Game Over".