Technically two glitches in one, as you fly past the world & can stand on invisible ground...
Step 1: End of the World
Go to the end of the world.
Step 2: Fly
Fly up until you think you are a good distance in the sky, above the clouds.
Step 3: Move Forward
Now fly forward and you will pass the end of the world into cloud land!!!
Step 4: Drop
Double tap the "jump" button on the d-pad and fall down. Instead of dying, you will fall onto an invisible place...Now take a screenshot ( home & off/on button @ same time )
Step 5: Quit to Title & Go Back On
You will find yourself at the end of the world again. Weird, huh?