Trying to be spoiler free here:

 

I just noticed that the town criers will report news from in-game events.  My party did, uh, "something", and later on when walking around in one of the big cities, there's a town crier going on about the big news from afar.  Caught me off guard, in a good way.  It's the sort of little detail that adds a lot of immersion, and could easily have been left out in a lesser game.

 

Nice world they've built.

 

 

Another neat little thing is if you pick up a certain large character to work at your stronghold, he'll take note of improvements and even certain individuals you hire to defend it.  

I laughed at the kid and the knife story, definitely a nice touch even if I sorta saw it coming.