So, I'm not sure if it's been mentioned earlier or if it's been covered already, but I found a niche little detail. Basically, when you go after Campbell, you can peep through the keyhole and see him talk with Curnow, that's clear enough. However, if you continue to look as Campbell tries to open the door with one of his keys, your vision will actually be blocked every new key he chooses. It's such an little detail... One that probably most people never knew of. But I love it.
Daud's taunts toward Corvo at 1:14 sound much more like the stuff he says to him during the Flooded District. High Chaos gets the cool dialogues but at what cost....
Given how calmly the Assassin speaks when Daud has literally choked him and held a knife to his throat, this is clearly not the first time he’s done this.