Easy Money:
On the East Road just out of Hobbiton, past the woodsman who trades his dagger for pipeweed, on the ledge above the stumps that summon the elves is a house. Enter it and walk up to the bookcase. Press Action and a gold coin will appear. Leave the house and re-enter. Another gold coin will be there. Repeat this to get as many coins as needed.
Moria's 21st Hall:
To pass the 21st hall in Moria, go to the center of the room and push or pull the four blocks of stone with hands on top of the tiles that you can step on. Once you put all four on, you will pass that part of Moria.
Moria Door Chant:
"Melon"
Defeating the Ring Wraith:
When you fight the Ring Wraith on the Balrog, there is a tower with steps that you can walk up. If you stay up there, the Balrog cannot hurt you, except when it takes flight.
Defeating the Barrow-Wight:
Run up to the top right corner and there will be a chest. Jump onto the ledge it is on to get the dagger. Then, put the ring on and hit the Barrow-Wight. It will go underground. Take off the ring, and when it returns, put the ring on and hit the Barrow-Wight. Frodo will sing Tom Bombadil's song and you will defeat the Boss.
Westernesse Dagger:
When you get to the point where you are looking for Merry, Pippin, and Sam in the cave, you will see a box. Go to it and you will get the dagger.
Wake up Lobelia:
When you have to escape from the Dark Riders in Bywater, throw a rock at the bell five times. You will see her lights turn on.
Silver Pin:
At the start of the game if you talk to Ted Sandyman, he will say that he is looking for a silver pin. The pin is hidden in the weathervane over by the river. You will see another Hobbit there. Press Triangle to talk to him. He will ask you to throw a rock at the weathervane to get it to move again. When hit, he will give you the silver pin.
Unlimited Dwarven and Elven Shots:
When you are at the Prancing Pony Inn and have just defeated the two ruffians who stole your dagger, go through the open window and climb up the ladder. Once up, you should notice that the ring is spinning in its slot. Turn to the right and use the ring. You should see a platform with both an elven and dwarven shot. Collect them and jump back to the ladder platform. Then, take off the ring and put it back on. You will notice that the items appear again. Do this as many times as needed to get unlimited elven and dwarven shots.
Get the Fish:
Just before you get to the second campfire with the two trolls and the wolves, look for a fallen tree. Follow it to the top of the hill and you will meet Gollum. After a brief cut scene, the vile creature will throw you a fish -- which, for the rest of the game, replaces Aragorn's sword and proves to be a mighty weapon indeed.