There are many irregularities on the world map and arguably the most prominent type is that of exclaves and enclaves. A quick breakdown of these terms: When a country owns a piece of land inside the territory of another country then this is considered an enclave. An exclave doesn't nessecarily have to be surrounded by another countries territory, it is just not physically contiguous with the main territoriy of that country. With that out of the way, try to name as many around the world as you can, with the help of a map.
You are right, I skipped over a particular section of the list. I've updated the quiz so that it includes all arguable contenders and the category they belong to :)
Akrotiri and Dhekelia should either be their own thing each, or Akrotiri should suffice, since on the map Dhekelia isn't shown. Kaliningrad shouldn't need "oblast" written in either, and so should Dubrovnik not need "region" next to it. Also, Nakhchivan should be a type-in too, since it's the actual written name of the place. All in all, though, very interesting and enjoyable quiz, good job!!!