Use Ooccoo before saving and quitting in that room.

Then, when you come back, return to that room with Ooccoo.

Second, why does Link, every time he picks up a 10 rupee piece, show it to me and says: its a 10 rupee piece, like he picks up the boomerang or something; I know it is Link, I picked it up about 50 times before.

It only happens once everytime you start playing again.