Old trick is old. And thread title is vague at best... Anyway, it's just the practical use of the map glitch on stairs.
I showed this trick in countless buildings before. It works on both systems. Also on 360 an emulators of course.
Here is it performed at the mentioned point in the game by puri_puri. I think he was the one that came up with doing the map glitch on the stairs. That's where I got the idea from anyway.