>>715678130
Interacting with Noelle's desk in her room nets you the Jingle Blade, which is really just a stronger Bounce Blade.
The moss is at the end of the corridor you find the egg room.
If you use the wisp to go back to the First Sanctuary after getting to the third one you can get a dog dollar in the spot where you sealed the first fountain.
If you for some reason like spiders and are the type of weirdo to give them all your money throw 10k into the fountain in the First Sanctuary and claim your prize in the Second
I think thats it