At the title screen, press Left, Left, Left, Left, Left, Up, Up, Up, Up, Up, Right, Right, Right, Right, Right, Down, Down, Down, Down, Down, Select, Select, Select, Select, Select.

Enter 'staff' as name. You can find the ending sequence at the snack shop.

When the title screen comes up, press left 5, up 5, right 5, down 5, and select 5 times. Go to test image. Whoever you have for a character will come up in a close-up version.