I'll gather my thoughts and list the bugs I found.
1) In the third mission, the heroes haven't been fixed. That is, all classes are available, and the heroes are still named as they were before.
2) In the same third mission, there's a tower in the upper right corner that gives +1 to Magic/Knowledge. The path to it is blocked by mountains - you can't enter.
3) The observatory in the center of the map in the second mission, in my opinion, is unnecessary. It reveals the entire map at once, creating an imbalance.