It is possible to skip Goron pounding a switch and entering the sewers entirely with Mask Jump.
This setup is harder and more precise than the previous one, but it still works.
Performing Restricted Items underwater from Zora to Deku next to the vent that throws you out of the sewer, Deku Link will activate the flowers and you can fly over skipping going into the sewer at all.
By performing Timestop in the room with the Hookshot, it is possible to walk past the trigger for the bee cutscene to skip it entirely.
After performing Timestop, walk down to the end of the hall and become Zora to hit the beehive. Once the beehive cutscene is over, drop down and grab the Hookshot like normal.
It is possible to get the Piece of Heart in Lulu's room without getting the Mountain Title Deed.
To do this, wear the Zora Mask and backflip onto the table in the back of the room. Face the shell chair in front of the Piece of Heart and roll jump off the table towards it. You'll hit the top the shell and jump off of it and get on top of the ledge, thus skipping the deed.
It is possible to enter the Great Fairy's Fountain in Zora Cape without the use of any Bombs.
The way it's done is by performing Down A on the same platform as the boulders, then you can simply walk through them and enter the fountain like normal.
By performing a ledge clip as Zora Link on the left side of the chimney where the gate is located, you can skip the mask puzzle allowing you to get the Heart Piece without having the Captain's Mask.