I think that the bonus areas for the castle and airport should be more clearly defined. I play the map A LOT so of course it is simple to me. While playing an opponent recently though they brought up that it is not clearly marked what is flughafen or das schlob. Looking at the map I agree that it is not clear at all. Perhaps the border needs to be thicker around the castle/airport territs or some kind of shading/coloring to be assigned?
Just my .02 but it would improve the map and make it more user friendly I think.