Bug 1: the character Daxus the Slaver, from a quest I did, when I fought him, he had no powers, no attack, no defense.  His description just had the text line, something along the lines of  "What are you looking at", which i found quite funny, honestly.  But it was very weird to have an enemy who presented no threat at all.  (he was from the quest where you rescue the little girl from the slavers, and then they give you a family artifact.  Or I could have had the slaver guy join me, but then I would be evil, and deserve to lose the game) .

Bug 2:  I watched an AI pioneer take a city location that was a 2/3/1 spot, when there were two different 3/3/1 spots RIGHT next to the 2/3/1 spot.  This was not done in order to grab forests, or rivers, or any other improvement that I could see.  This was just the AI being stupid.