When I click and drag anywhere on the screen, the globe rotates. Unfortunately, that includes clicking and draging the End Turn button. When I drag a little while clicking it, the glob rotates a little at first, making me think I mis-clicked, but no, the turn actually ends. This happens to me a lot.

Maybe add a shading or depression animation to the button, so that pressing it will feel more visceral?

Fixed this: the mouseover/mousepress highlight for the button is now much clearer, and the globe won't turn if you click the mouse on the button itself.