By performing Boss Door Clipping, it is possible to clip past a boss door, which means entering the next room without triggering the transition.
Since the transition isn't triggered, no actors, walls, cutscenes etc. are loaded on the other screen, meaning Link can freely walk around. The loading zones, however, are always loaded.
Using this, it is possible to trigger loading zones on any side, allowing for some pretty interesting skips.
To perform Boss Door Clipping, you will either need the Lantern or the Magical Boomerang.
After clipping, you will not be able to go back up and walking downwards too far will trigger and load the correct screen.
Keep in mind that it is very easy to softlock when going to another screen, since there is a high chance you will spawn inside a wall or even out of bounds.