I don't think the Triple-Slash Clip has been mentioned yet. It was discovered by someone at zeldaspeedruns, and is used to clip through walls!
You need to find a corner where the walls make an acute angle. *insert Angle Dance joke here* Back yourself into the corner, and make Link face slightly to the right. Perform a triple-slash (B three times quickly), then immediately put your sword away (spam A during the third slash). If nothing happens, change your position slightly. If you were positioned correctly, you'll find yourself on the other side of a wall.
You can use this to get inside things, like the gate at Kakariko or a tree in the Lost Woods where you play the ocarina game with two Skull Kids; or you can go out-of-bounds and re-enter in other places, like going through a wall in Kakariko then floating toward the center of town underground using a cucco to access the Bottom of the Well early. You can skip King Zora (except then he'll be frozen blocking the way when you're an adult so you can't access Ice Cavern). There are uses in some dungeons including the Forest Temple.
You gotta be careful though, because many walls don't have ground on the other side, so you'll just fall into the abyss. There are several youtube videos about this, probably explaining it better than me.
Oh, another fun one: "Navi dive," also discovered at zsr, can be used to leave Kokiri Forest early, and access Zora's Domain before getting bombs. In the Lost Woods, by the portal to Zora's River, stand next the the stone slab rising out of the water so that if you triple-slash, your sword will hit it and push you back just to the edge of the water. While you're doing the third slash, spam the Navi button, and you'll call her just when you're done but still moving backwards. While talking to her, Link will fall into the water and sink to the bottom. Leave the dialogue and immediately enter the hole before you float to the surface.
but some of these new glitches are distracting and take you out of the game for a moment.
