I decided to research Phantom Hourglass as my first contribution to this project. I will post glitches here as I find them. Today I found a variety of minor glitches that can be done with the grappling hook. First go to the room right outside from the 1st boss battlefield in the fire temple. You must have obtained the grappling hook from the ice temple place to do these glitches. There are 2 torches on each side of the stairs and 2 stone tablets next to each of them. By connecting the 2 torches with the hook, there are multiple things that can be done: #1: After they are connected, run straight into the rope and it will stretch a bit but you walk right through and up the stairs as soon as you touch them!
#2: Get right between the torches and connect and as SOON as you let go of the hook, push backwards on the rope or you will get pushed into the animation of going upstairs. While pushing back all the way, you can launch yourself to the top and link will have the animation of walking down the stairs for a second but warp upstairs! Also, if you just push on the rope and ease up a bit and launch slightly, you will land halfway up and hit an invisible wall that pushes you backwards through the rope.
#3: Now here is the really good part. Do the steps in glitch #2 but this time, slide over a ways next to the torch on the
right. Ease up on the rope a bit while still on the right and if done correctly, it will launch link ONTO THE WALL! For some reason it doesn't work on the left side. You can now walk around on the wall in the room but if you get too far on the black part you fall through so be careful and never go more than having one foot on the black part. The crazy thing about the falling through is Link doesn't scream and you get warped outside the wall and lose a bit of health! If you use a bombchu, it can actually crawl around on the blackness for a ways before hitting an invisible wall. but a normal bomb falls right through

. You can also walk around to the downstairs and do the stair animation glitch there by walking off.
#4: When on the wall, you can carefully walk onto the stone tablets but not the torch and link falls into them on either side . On the right side, if you start running straight towards the torch, the screen will shake madly and you can even get Link to be constantly pushed between the two while not pressing anything! Watch carefully and use an item like the boomerang (but not the hook) and then stop and Links head is in the flame (w00t my heads on fire aaaa!). You can also connect the torch and tablet for the games shortest rope while in the 2, and can push the rope, but if you get the right angle, can only launch on the left side (which does nothing as there is a wall but its weird anyway).
#5: A shortcut to getting to the left side on the wall is by going behind the stairs and around! Yeah, I know, its weird but you can carefully get behind the stairs and if you walk to close towards them, the animation glitch happens and it looks like his head fell down the stairs

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Well that pretty much covers everything you can do in that area. I will post other glitches in this board when I find them. Enjoy!