Nuissances:
1# When enemy civ declares war on you, and some other AI civ wants to talk to you on the same round, you hear the trumpet sound, but after that you see the other AI civ diplomacy screen first. Happened to me a few times: trumpet plays, Ghandi shows up to propose ivory deal of the year, and its after Ghandi gets dismissed that Catherine declares war.
2# War Elephant graphics. When fighting with war elephants, and combat animations turned on, quite often the combat animation gets prematurely ended. For example the first elephant dies and falls, the second freezes in mid move, and combat animation exits, just stating results of the match.
Happens only to war elephants.
3# OCC and city flipping. When city makes "cultural flip" in OCC, it, along with its civilization, gets destroyed. Pretty obvious here. The problem is that this way of destroying cities does not leave city rubble that's normally left when city gets razed. Maybe it should? (go go Tiny Pangea OOC with 18 civs)
#4 OCC and city flipping. Playing on Noble difficulty, enemy AIs did nothing when their "one city packed with dozens of modern armors" was about to flip to my side, thus getting destroyed and causing a total loss for that civ. Maybe AI could be tweaked a bit so in that case the civ approaching destruction would go all rampage? Or is it already the case on the higher diff levels?
Bugs:
1# One City Challenge & Cultural Victory Condition - basicly its impossible to achieve cultural win in OCC. When you start OCC it still lists three cities with legendary status needed for Cultural Victory. Pretty impossible with one city limit. Tried it only on "quick" speed.
Request for Improvement - razed ruins could be used as a place for placing quarries, usable for the number of turns equal to razed city size * 5.