During the Light World fight with Agahnim, he turns into a shadow, and moves around like that. If you bring up the map exactly when he is turning from shadow to real form, his colors will be really distorted, or he will look transparent, just like the 2 fake ones during the second fight. If you keep doing it, his colors will keep changing.
After you get all the statues from completing the riddles go into your house and select the magic powder. Sprinkle it on the statues and they will sparkle. Sprinkle magic powder on them again to get them in color. Sprinkle them one final time to get Bunny Link, skinless chicken, and Zelda as an old lady.
After you've gotten the Power gloves go to the desert area in the game. Once there find the man thats sitting next to his sign. Go a little bit south and to the left where you should find two large rocks. Lift up the rock below the top one and a secret area will be opened. Once inside you'll notice a thief and 10 different pots that each hold a blue rupee, break open each pot and take all the money. You'll be able to do this as much as you please because the blue rupees come back every time you leave and reenter the area. It should only take a few minutes to get the maximum amount of rupees.
In the light world, go to where you recieved the flute. Go down one screen. To the right where there are two trees. Stand next to the top tree and use the Ether medalion. Walk away from the tree and ram into it with Pegasus Boots and a head like Blind in her human-ish form will fall down and explode as if it were a bomb.
Once you've gotten the super bomb and already blew up the wall blocking the dark worlds fairy go inside and make sure you have at least one empty bottle with you. Go up to the Mysterious pond and it will ask you to throw something in. Scroll through your items until you come across an empty bottle, then throw it in the water. The Fairy will come out and ask you if you droped it. Answer yes and the fairy will say she likes such an honest person and will fill your bottle with green potion. You can do this as many times as you want.