1st troll: "Imminent Fall."
There are many invisible paths in the Crystal Caves. There are also some messages made by the devs to help you find them except one. It is placed at the start of the last invisible path, the one that leads to the boss. It reads, "Imminent Fall", but there is a bridge there, not a fall. Although it is possible to fall off of the bridge if you don't walk in a straight line.
2nd troll: Oswald
Some players, including me, bought multiple indictments. This is because we thought they were one use items. Every infinite use item in the game can only be acquired once. There are two exceptions. The first is the Dried finger, but you can only have one in your character's inventory. The other exception is the indictments. Also, Oswald says, "Stocking up on Indictments? How ... honourable of you. Heh heh heh heh." Notice the pause.
3rd troll: Divine upgrade path for shields
Look up every shield in the wiki. None of them get improved defense from the divine upgrade path. A divine +10 = a normal +0 in terms of defense. However, they also get magic damage that scales with faith.
4th troll: Raw upgrade path
This upgrade path is crap, and that's because it wasn't finished. It starts at normal +5 and stops at Raw +5. This means a Raw +5 is on the same level as a normal +10. It is also the only path that stops here. Every other upgrade path stops at the same level as normal +15. This is also why Raw doesn't need any embers or slabs. If it had an ember, then it could go up to Raw +10 and actually be useful. A raw +10 would be at the same level as normal +15.
Does anyone else know about any trolls added to Dark Souls?