Trials Skip
Through various previous sequence breaks in the game, it is possible that by the time you get to Ganon's Trials, you will not have enough items to complete them. Fortunately, there is a way to skip these trials and head straight up the tower to Ganondorf.
Megaflip
Discovered by CloudMax
Requirement: 1 Explosive & Shield
Go to the lower stairs located to the right of the tower. Position yourself so that you're standing next to the ledge on the 5th step counting from the top. Face toward the loading zone and turn around 180 degree. Place a bomb on the 4th step and megaflip. If done correctly you'll hit the loading zone and enter the tower. This method is very precise.
Megaflip + Damage Boost
Discovered by MrGrunz
Requirements: 2 Explosives & Shield
Go to the lower stairs located to the right of the tower. Position yourself so that you're standing next to the ledge on the 6th step counting from the top. Face toward the loading zone and turn around 180 degree. Place a bomb on the 5th step and throw a second bomb towards the loading zone. Now do a megaflip. If done correctly you'll get hit by the second bomb, giving you enough height to reach the loading zone.
Hover Boost
Discovered by Kazooie
Requirements: 1 Explosive & Hover Boots
Go to the lower stairs located to the right of the tower. Position yourself so that you're standing next to the ledge on the 5th step counting from the bottom. Face toward the loading zone and place a bomb behind you. Now do a hover boost. Do a backflip right before you reach the tower. If done correctly you'll reach the loading zone.
Hammerslide
Discovered by Kazooie
Requirements: Hover Boost & Megaton Hammer
Go to the lower stairs located to the right of the tower. Position yourself so that you're standing next to wall on the 5th step counting from the bottom. Face toward the loading zone and turn around 180 degree. Now do a hammerslide. Do a backflip right before you reach the tower. If done correctly you'll reach the loading zone.
Freezard Clip
Discovered by ZAR
Requirements: Hookshot/Longshot
Go to the water trial and bait a Freezzard to come extremely close to the door. Use the hookshot clip on the Freezzard to get into the main lobby unloaded. From there navigate your way up the stairs and into the tower.
Armos Clip Method
Requirements: None
By arranging the armos statues in the first room in the spirit trial in a specific way, it is possible to clip into the main room out of bounds. Once you have clipped, simply navigate your way into the loading zone.
Backwards Hookshot Jump
Discovered by Pedalpowerluigi
Go to the Shadow Trial and do a BDJ off the torch in there to go OoB and then navigate to Ganon's Tower.
Hookshot clip (MQ only)
Discovered by TheWayfaringFox
Requirement: Hookshot/Longshot & Boots
It is possible to Hookshot clip into the main room of the castle out of bounds using the torches in the very first room. From there, navigate to the loading zone.
Entrance Point Glitch
Discovered by Flameringer
Requirements: Bombs
By performing Entrance Point Glitch on the door to any of the trials that you can void out in (all but Light and Spirit), you can walk into the main room unloaded and then navigate to the entrance to Ganon's Tower.