History DevelopersForesight / TheElderScrollsVSkyrim

* You can encounter bandits trying to raid a giant's camp north of Rorikstead in Whiterun. Usually these bandits will be wiped out quickly, but on the off chance one survives and flees, he won't just randomly run away. He has a custom AI package that causes him to run to a cavern named Oritheim north of the giant camp, where some more bandits live who are surrounded by mammoth remains, and the bandit leader had a journal complaining that they're running out of food and desperate for anything, including mammoth meat. What really makes this a case of DevelopersForesight is that once you've cleared this bandit cave out, the attacks on the giant camp will stop.

* Frost Atronachs will not fight Wispmothers, as they are both frost elementals. If you're fighting a Wispmother and use Conjuration to summon a Frost Atronach to help, he'll simply kneel before her, and she'll continue to send her Wisps to attack you.

** Miracle is the ultimate Enchanting perk, and allows to put ''three'' enchantments (instead of the normal maximum of two) on an item, and makes those enchantments stronger than they normally would. The perk's description states in explicit terms that it only works once, and, indeed, turning the Enchanting skill legendary in order to train it again to 100 will fail, since the game will refuse to let you get the Miracle perk again.

* In Elenwen's Solar during "Diplomatic Immunity," you can eavesdrop on a conversation between a Thalmor agent and one of their spies, Gissue, who is looking for Esbern. If you don't kill the spy before he's dismissed and leaves, you can find him later in Riften in the Ragged Flagon. Pickpocketing him reveals orders that he's there waiting for you to show up. He has nothing to say to you, but once you ask around about Esbern, he leaves the Flagon and you can follow him to eavesdrop on him talking to his Thalmor contact. Evade detection from them and head back into the Flagon (or just wait in there for them in the first place) and you can witness the Thalmor soldiers come in and question the owner, then leave when he refuses to cooperate while Gissur stays behind to keep an eye out for you.

* An unfortunately under-thought instance in ''Dragonborn'', it's possible to get the first Word of Bend Will and use it to cleanse the All-Maker Stones before getting the quest to do those tasks. However, all that happens if you do this is that the story jumps to this point, resulting in Storn thanking you for completing a task he hasn't given you yet and the player's dialogue responses being like they understand what he's talking about when he mentions cleansing the Stones. It's somewhat mitigated by the fact that nothing in-game tells you to use Bend Will on the Stones until Storn gives you the quest to do so, so if you ''did'' skip ahead, you already know what's going on anyway. On the practical side though, not getting the quest to cleanse the Stones before doing so means you don't get the unique powers from them you would have for cleansing them (at least said powers aren't very good so you won't miss them).

* Vanilla radiant quests can randomly use modded content: kill mobs in a mod dungeon, inflict a beatdown to a mod NPC, find a mod item heirloomn etc.[[note]]Though they can also be UnwinnableByMistake if you're ordered to attack an essential-flagged NPC who stands in a dungeon you can only visit under specific circumstances[[/note]]

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* If you save the game while in a transformed state, the save game will list your race as the race you transformed into rather than your default one (i.e. Werewolf, Vampire Lord, etc). This even includes races that you console command into (like Mudcrabs) or races added by mods (like Dagi-Raht, Dwemer, etc).

** You're expected to complete the Thieves' Guild questline without killing anyone, and if necessary, only killing nameless enemy guards instead of important NPCs. However, none of the NPCs you interact with (with a few exceptions like Calcelmo) are essential, meaning you can kill almost all of them, even the ones you're specifically ordered to not hurt. Doing so nets you unique (and angry) dialogue from Mercer, Brynjolf, and Maven.

* [[spoiler: If you progress far enough into the Companions' questline to become a werewolf, then join the Dark Brotherhood, Arnbjorn, who used to be in the Companions and is also a werewolf, will know you're one the first time you talk to him and hopes you have better luck with them than he did.]]

* [=NPCs=] will interact with items you drop on the ground, and react differently depending on the item, their social standing, and their relationship with the player. They may just take the item, or they may approach you and return it. If two [=NPCs=] approach the same item, it's even possible for them to argue over which of them saw it first, and they'll fight over it. If even works on enemies, allowing the player to get them to kill each other if they can sneak into a room and leave an item behind without being seen. If the items you drop are weapons, a guard will approach you and tell you not to leave weapons lying in the streets, because someone could get hurt. If you're a jerk to them about the warning, they'll issue you a small bounty as a fine for disrupting the peace.