I have seen a number of minor bugs:

1) The narrator keeps narrating the same events, telling me e.g. that I'm being ransacked for the first time, though more likely the 10th.

2) If there's an existing battle, and an army lacks 1 movement to enter it, the cursor will still tell me it can get there, leaving the army stranded uselessly on the border of the action.

3) I just finished a game by discovering all the science; nonetheless, to the very end the siege interface insisted I had not discovered any siege equipment.

4) When I win a war by exhausting the opponent's war support, I'm forced to accept their forced surrender. There is a cancel button, but I have not yet seen it not greyed out. This might not be a bug, but as far as I can see it precludes vassalizing opponents, because it will always require about 150% of the available war score.

5) The Japanese shrine, the Tara I think, will not show its prestige bonus (or whatever it's called, the purple stuff you use to build cities) from surrounding mountains in the tool tip.