A weird thing is how "Eastern" Dale and Laketown look from the stuff I've seen.
The Laketown guards all have conical helmets, the structures have a very non Norse style to them which you'd expect.
The Norse style has already been used on Rohan, so a copy of that wouldn't be original. Besides, I think they still wanted to use some northern elements, the Slavic states had a lot of Norse influences, so PJ probably used those for the movie. Dale and Esgaroth use Norse stuff, but in a Slavic version . Oh well, we need to wait for the behind-the-scenes stuff to confirm this, it's all just theories, and very interesting indeed .