The Legend of Zelda (NES) Extra - Secrets + Glitches

Played in real time on BizHawk 2.3.0. Note that the first portion of the video where I collect heart containers and rupees, later spent on a blue candle and blue ring, was sped up to save time.

Indoor Music Glitch
Upon buying the blue ring for 250 rupees, you'll either need to exit and then re-enter the shop, or draw the subscreen and press A + Up on both controllers, then enter then the Wooden Sword cave quickly while your rupee count is still draining.

White Sword Before Level-1
It's possible to get the White Sword before beating Level-1, however; you'll need to collect at least five heart containers. I also recommend buying the blue ring and magical shield beforehand.

Self-Unlocking Door in Level-1
If you leave Level-1 and then walk back in right away, the door at the top will be automatically unlocked. This trick will only work on your first visit.

Fairy Fountain Glitch
Pull up the subscreen while your hearts are still being refilled at the fairy fountain, then press A + Up on both controllers. You'll still have full hearts when the game is reloaded, rather than the default three.

Second Quest Shortcut
Start a new file with the name "ZELDA" to skip the first quest.

Shortcuts in Level-2
It's possible to visit every room in Level-2 without having to unlock a single door. In the room with three blue Goriyas guarding the magical boomerang, bomb open the top and bottom walls, and you can get both the map and compass as well as a visit with the old man who tells you that "Dodongos Dislike Smoke."

Keep Bait
After feeding the hungry Goriya, pull up the subscreen while it's still flickering, then press A + Up on both controllers. Although the bait is still in your possession, the Goriya will be long gone by the time you return.

Walk above NPCs
There is a restricted area in every cave where you normally cannot walk into. Go to an empty cave with the red candle equipped, use it, and then run into the flame almost right away. Continue to repeat this step a few times until you are freely able to walk within' the restricted boundary.

Moving Attack
This one is rather tricky. You have to walk towards a door, and then draw your sword just as you are touching the door.

Solid Walls(?)
Go to any second quest dungeon with a false wall, facing south. Walk through the false wall, then turn back north right away. If done right, Link should be seemingly stuck inside the wall. Go back south, and Link will skip a whole row of tiles in the next room, disregarding anything in the way.