Get Hena at the Fishing Hole mad: Roll into the walls inside the hut to get Hena pissed. After about 4 times, she'll kick you out and won't let you fish again until you apologizes.
Rollgoal Minigame: Turn left of the pictures on the wall of the Fishing Hut, and look at the table with the game on it. Hena will ask if you wanna play (5 rupees). If you beat all 8 levels, you will get the frog lure.
Hat rack: Look at the hat rack in fishing hut and Hena will say something interesting.
Hena's Talking bird: You can hear Hena's bird saying things if you listen closley.
Getting Frog Lure: See above.
Getting Sinking Lure: Start by catching the Hylian Pike, Hyrule Bass and Ordon Catfish by lure fishing. Leave the fishing hole and comeback in. Go to the grassy ledge north of the bridge, and fish facing north next to the wall. Bobber fish here and eventually, you will come up with the completley forbidden sinking lure!
Fishing for the Empty Bottle: Go to the bridge in the fishing hole and bobber fish the little section there. Fish for a while and you will come up with an Empty Bottle.
Catching the Hylian Loach: Once you have the Sinking or Frog Lures, go to the fishing hole's northern most section where the lily pads are in the summer season (everything is green), and fish. The Hylian Loach looks like a Hylian pike, but with kind of scribblings on it. Now go to where the pictures in the hut, and you'll see a picture of yourself.
Fishing Guy from Ocarina of Time:
Do you remember Ocarina of Time? The fishing dude from it has a picture on the wall!
Wallets: 600 rupees- collect one of the golden bugs and bring it to Agitha in South Castle Town.
1000 rupees- collect all 24 golden bugs and bring 'em to Agitha.
Giant Bomb Bag: Get 25 points or more in the boat challenge in Upper Zoras River.
Quivers: 60 arrows- Get the Clawshot from the Lakebed Temple and go to the guy, Purlo, in the circus tent in West Castle Town. Complete his STAR challenge to get it.
100 arrows- Get the Double Clawshot from the City in the Sky and complete Level 2 of Purlo's STAR challenge.
Night to Day, Just like Th-.... BAAMMM!!: Once you have access to the City in the Sky, when it is night, go there via the cannon, and go back to earth again. When you return, it is day!
Obtaining the Magic Armour: Once you've completed the Lakebed Temple, go to the Malo Mart in Kakariko Village and Gor Ebizo will be there with a donation box. Donate 1000 rupees to build a bridge from Castle Town to Bridge of Eldin Hyrule Field. Then donate another 2000 rupees to buy Chudley's rip-off store in Castle Town. You may be saying "WHOA! 2000 rupees?" Don't worry, there is a way to lower the cost. Go to the lazy Goron on the new bridge and talk to him. Go to Kakariko village and talk to Gor Liggs outside Malo Mart. He will give you a barrel of hot spring water to bring to the Goron on the bridge. As soon as you reach the Goron, don't hesitate! Throw that barrel on him and he's better. You get a Piece of Heart AND the cost of the shop buying process lowers to 200 rupees!! Donate that money and bring a golden bug to Agitha in South Castle Town to get the 600 rupee wallet if you don't already have it. Now go to the old Chudley's Eporium location (southeastern corner of Central Square) and you'll notice that the prices have gone from rich guy prices to hobo prices! Save up 598 rupees, and buy the Magic Armour! (I'm from Canada, so I spell some words different, EH?)
R2-D2 in Snowpeak Ruins: Enter Snowpeak Ruins and you'll find the first room is packed with paintings. In one of the corners under the stairs, there is a painting of R2-D2!! bOLLEING eee diddeleot (isn't that like his language or something?)
Postman in the Cave of Ordeals: Go to the Cave of Ordeals in the Gerudo Desert (where you found the piece of the Bridge of Eldin) and complete the Cave of Ordeals TWICE. On the second time through, stop at the last ledge and you'll find the Postman. He is looking for the Great Fairy.
Golden Cuccoo chanting: As a wolf, talk to the golden cuccoo that Rusl gives you and she'll sing... a familiar song. (Hint: A song about stars except with CUCCOO lyrics.)