I'm enjoying this game immensely. I have found a number of bugs and mistakes. Most of them don't really detract from the game experience, but there are a couple of things you might want to change.
First off, the two biggest problems--there are at least two spots where you can ask a question in dialogue that should not be available without more information (I'm only up to Chapter 4 so there might be more). These are the spots, enclosed in spoilers:
When I speak to the jeweller woman after re-entering Carbonek, as soon as I introduce myself as Brann, 2 dialogue options become available which refer to the fact that she has my magic belt--in spite of the fact that the belt is NOT in the shop and the woman has NOT mentioned it, so I have no way of knowing she has it.
When I speak to the cider woman in the village in the 4th Chapter, I am given the option "Who is the robed girl I saw in the orchard?", in spite of the fact that I had not yet visited the orchard that day and had never seen any robed girl there.
Second, the castle escape--
The stairs you have to take after exiting your room are nearly impossible to notice. I tried everything after leaving that room, and finally went to check the Hints and Tips forums. Even AFTER reading that there was a second set of stairs near the guest room, I still couldn't find them right away. I would strongly suggest making those stairs more visible or noticeable somehow
Third, there's a rather funny bug during the castle escape. When standing in the barracks, if you use the vase on Gereint or the guard, it does display the appropriate message--but the bug is that before that message is displayed, Gereint or the guard will say whatever it is they would have said if you used the vase on them earlier. The result is that if I use the vase on Gereint, for example, he says "I think that vase is from the king's chamber," in spite of the fact that he's not supposed to even know I'm there.
Finally, with regards to the language--I see a lot of complaints here about it but I actually like the medieval-ish language. The only problem with it is that every now and then you use a word wrong. For example, the bridge scout says "ought" when I think you mean "nought". Also, Gereint says "three years hence" when referring to an event three years
ago. "Hence" means "after" or "in the future".
Other than those things, this game is amazing! One of the best AGS games I have ever played. That intro movie is terrific, it really sets the scene and draws the player in. The story is fun, the puzzles are challenging but not frustrating, the graphcis and music are superb, and the game is just overall fantastic.