Once you have beaten the regular story, revisit Weathertop (doing so after nightfall seems to work best). Use the rope on a hook and a board appears. Proceed to the end of the board and a trail of blue studs will appear that leads to a puddle. If you leap off the board, you'll hear the sound of an eagle and then land in the puddle, like an assassin leaping from a viewpoint and landing in a bale of hay or some brush in the Assassin's Creed games.
Cheat Codes
Enter cheat codes in the Extras menu.
Effect
Code
8-Bit Music
GD35HC
Action Assist
T1JM4R
Attract Studs
C7FJ7B
Berserker
UE5Z7H
Bilbo Baggins
J4337V
Boromir (Captain)
HTYADU
Boss Disguises
F3H14H
Character Studs
PR3V4K
Denethor
RJV4KB
Disguises
MX26RJ
Easterling
R7XKDH
Elrond (2nd Age)
A9FB4Q
Eomer
U47AOG
Fall Rescue
WS68P2
Fast Build
A2LU58
Galadriel
7B4VWH
Gamling
AVJII1
Gondor Ranger
LG5GI7
Grima Wormtongue
BU95CB
Hama
73HJP6
King of the Dead
IH7E58
Lothlorien Elf
C2A58D
Lurtz (Newborn)
QL28WB
Madril
C19F3A
Minikit Chest Finder
A24TVJ
Mithril Brick FInder
B72D7E
Mithril Hearts
2MCRDN
Mouth of Sauron
F4M7FC
Poo Studs
D49TXY
Quest Finder
EY4K32
Radagast the Brown
5LV6EB
Regenerate Hearts
H5L6N6
Ringwraith White
LYQU1F
Shagrat
PJB6MV
Studs x2
1F5YH2
Combining Herbs (Resident Evil Easter Egg)
As you work your way through The Battle of Pellanor in Free Play mode, you can dig up a Red Herb and Green Herb, which can be combined into a Med Kit that is used to heal an injured soldier.
Elder Scrolls Reference
There's a Fetch-Quest in Edoras (near the Warg Attack mission) where the guy talks about how he used to be a citadel guard, until he took an arrow to the knee.
Skyrim Easter Egg
When you talk to the man over the gates to Rohan, he will ask for bandages, explaining that he "took an arrow to the knee." This line is a reference to the famous line from The Elder Scrolls V: Skyrim.
Assassin's Creed reference...