The public announcement system voice states at various times that there is a whale oil ration. At other times it states that there is a whale oil ban.
The swords used by NPCs do not have scabbards. Scabbards are a necessity to protect the blade of a sword from accidental damage as well as protect the wielded from accidental damage.
Grammar and spelling mistakes are present in subtitles.
Miss Curnow and the Admiral are standing in a room at one point. They only react to the presence of one another when the Player comes close enough to hear them.
When Emily is rescued, she disappears abruptly once she reaches the unlocked door leading to the outside of the Golden Cat, without the door even opening.
Some NPC responses to other NPCs do not make sense as part of the conversation.
It is possible for the Player to steal things from right in front of NPCs. The NPCs should notice this.
Hostile NPCs do not react to the flare being fired from Emily's tower.
If any machinery is disabled by the actions of the Player, nearby NPCs do not react.
If the Player exposes his position enough to alert an NPC, the NPC may say that they think they have seen rats - even if the Player is standing full-height (higher than any rat).
All doors can open both ways in this game. Most doors can open but one way.
Contaminating a plague elixir somehow doesn't affect the Chaos level.
In the DLC 'The Brigmore Witches', when Daod restores the water flow, there isn't anything that could stop the Witches from stopping the water flow again.
Rendering an NPC unconscious has the same effect as killing them, even though the two actions are different.
Immediately after Corvo escapes from prison, guards are talking about it in the sewers. The news could not possibly have traveled that fast.
Sokolov states that a test subject is going to die within earshot of the test subject. Nevertheless, the test subject believes him when he tells her that she will survive.
One prisoner that can be rescued on the bridge says that a building nearby contains a safe that can be opened. The building isn't nearby; it is the exact same building that she is imprisoned within.
If Corvo has his sword or other weapons drawn, it has no effect on the NPCs.