To not spoil anything, I put it in spoiler tags.
When talking to Shereth in the King's Inn, after this question that she asks:
You have seen them, have you not?
My character responds:
1. You seem to have a lot of items related to witchcraft. Do you have an affinity for the darker arts?

While this bug/issue made me laugh, I doubt it should end up in the final game, so reporting in case someone didn't yet. :P
I came across another one featuring some symbols after a sentence, but unfortunately I forgot to note it down...
PS: Not sure if it is supposed to be that way, but when talking to the woman on the marketplace
who reacted in panic demanding me to stay away, her name started with a K
my coop partner and I got a ! above our heads. Now, he was in a trade. While he was trading (which he said would take a while), I went to buy some potions, but when I came back and he was done, the dialogue possibility was gone.
Another thing I have to report is that while I was dead and waiting for my coop partner to be done, I was searching the environment for stuff by viewing objects nearby (have that function bound to my Alt key as it was per default), when I moved my cursor over an item, it turned into grab (I don't think that should be the case if one is dead and can't pick up), but that is less of an issue. I let go of Alt and moved my mouse away by moving the camera with WASD, the cursor stayed the grab cursor, although I was not hovering it over any item. I could only get rid of it by using the rotate camera function to turn it into the two-ended curved arrow. Once I let go of the rotating, it was all normal.
Something similar happened when I was moving my cursor via the camera movement over 3 barrels in Cecilia's house/room, but this seemed to crash the game after a second.
When using the
pyramid to teleport into Ceclilias room, everything is fine and the bathtub with her inside is called Cecilia (makes sense), but after she exits the bathtub, it happens to be called Cecilia - still - and it is Level 1. Now there are two Cecilias, one of which is a not really talkative bathtub.
It made me laugh, but again, I doubt it should be in the final game. :P
Some additional info related to this scene:
I also tried to pitpocket her while she was in the bathtub and she indeed had items. This is not a bug, but it doesn't really make sense to have items with you when you're taking a bath, just suggesting to change that so that she has no possessions while still in there and only having some when being out of her bathtub.
EDIT: I just realized I forgot to mention something (not really a bug but requires fixing anyway):
The furnace model that one can find in the city behind the abandoned house could need refinement. I can easily see that it is hollow on the inside simply because I can see right through the hole on top, I see whatever is behind it. The quickest fix I could suggest would be to select the loop of vertices right below the hole on top and dragging them deeper into the model so that it looks rather like a solid object than a hollow dummy. It somewhat broke the immersion seeing that.

And yet another bug which is rather annoying is that the camera height can't be adjusted properly when changing heights on terrain. When I walk downstairs in town, my camera ends up floating in the heavens while my character is walking somewhere down there because it doesn't change heights with the character and since there is a limited zoom this makes it end up flying high. Starting a conversation is the only possibility to get it back to the ground - alternatively one has to use a portal to get downstairs and spare oneself the hassle of starting a conversation merely to be able to see everything properly.
While we're at the harbor area...:
There are two bulls right next to each other. The northern one is called Bill (seems like a typo to me) the southern one is called Bull.
So, unless the Bull was supposed to be called Bill for some reason (which I would consider rather funny), I guess this might be worth to be mentioned. //Someone just told me this was an easteregg/reference
to the Belgian comic Boule et Bill
, didn't know that, so disregard the Bull and Bill thing.

Drawing the weapon while sneaking/disguised seems too abrupt to me, this is well visible when carrying a long weapon like a staff that sticks out. Making this smoother with a transition/additional animation could be worth a try as this is noticable.