It looks like they started with maps of Europe, mainland Asia, and Africa separately, but Asia was on a smaller scale and a different projection than the others, so there was a gap between it and Europe that they covered up by throwing in an additional Soviet Union. Then they made sure to include Indonesia, the Philippines, and Taiwan (but not Japan or any of the smaller countries around Indonesia) and drew in the other continents in a different style.I'm still trying to figure out how this even happened....
At least the great ANZUS Empire appears to be intact (with the other nations of the Americas presumably along for the ride), and unaffected by... well, whatever the hell happened here
I'm guessing Croatia is Muslim because it's just an annoying shape to work with. I have no idea why Korea isn't attached to China.