Paper Mario 2 The Thousand-Year Door Easter Egg - 2 Eggs in Petalburg

1) go to Kroop`s house. You should see 3 pictures on a shelf. The middle one is of NES red link(or NES zelda)
2) go to the bridge thingy that takes you to another screen. Go to the fence nearby, then look at the bridge thingy, you should notice it's not attached to the next screen.