This clip allows access to shop at night when the door is locked. With sword, you can easily climb the box to the left of the door, roll upright to jump off, then jumpslash over the door and into the loading zone.
The Treasure Box Shop minigame consists of picking between one of two chests that randomly contain either a key or a rupee reward, within a series of 5 rooms. The Lens of Truth allows you to peek into the contents of the chest, eliminating the random factor completely. Of course, you can get lucky by picking every chest correctly, which has a 1/32 chance of happening.
You can cheat the game on the 1.0 version by using the putaway method of Ocarina Items to play Sun's Song inside of the minigame. This will reload the scene without re-locking the doors you've opened or removing keys from your inventory.
As long as you have an explosive, it is possible to skip talking to Malon to get the Weird Egg and waiting a day for it to hatch into a chicken to wake Talon. This makes it possible to learn Zelda's Lullaby much sooner.
Simply stand on the little platform near the water, and do a damage boost with a jumpslash to boost yourself to the ledge. With a Bombchu you can shield drop it in mid-air or wait until it is about to explode before you jump. For a Bomb you must wait for it to explode.
You can also hover up, or Megaflip to the ledge.
Troubleshooting: If the bombchu rides the wall when you try to shield drop it, you dropped it too early. You must clear the pillar before dropping it in clear open space.
To get Double Defense the intended way, one must get the Golden Gauntlets and lift the rock out of the way to enter the Great Fairy Fountain. Using a Recoil Boost, however, allows one to skip the requirement of Golden Gauntlets, instead just requiring Hover Boots and the ability to crouch stab.
Get into the corner between the cliff and the rock, and align the right hand side of the B button with the edge of the cliff in front of you. Crouch stab the wall, and on the frame that you move backwards (also the second frame that sparks from your sword are visible), equip the Hover Boots. Unpause after equipping the Hover Boots, still holding your shield up and left on the analogue stick. You will then slide into the loading zone and will be able to get Double Defense provided you have Zelda's Lullaby as well as magic.
It is also possible to clip by Supersliding into the corner, as opposed to doing a Recoil Boost.