Forts

If you capture a region that has a ford in it, the ford changes to your culture. I captured Punjab in my British campaign and the Mughal fortes changed in a star fort. In my Ottoman campaign all the star fortresses in Europe became Eastern forts.

Trade

The trade screen can get corrupted. I have had a trade screen that wasn't showing trade while according to the diplomatic screen I was trading with a faction.
AND
I have now a trade screen where I have three trade routes with the UP and two with the Ottoman Empire. This ads some 12,000 extra gold to my treasury each turn.