There are a few things that I suggest need to be revised in this quiz. In no particular order: both Congos are missing; "Bosnia and Herzegovina" didn't work, because you didn't include the "and"; none of the usual type-ins work; JetPunk usually calls it "Cote D'Ivoire"; and it's always called "Russia", not the "Russian Federation".
I had revised whole quiz and fixed it .I think there should not more mistakes.I just imported answers from a website but I really don't know that it is that much bad website with so much mistakes.
You need "Russian Federation" instead of "Russia" but are OK with "Micronesia" instead of "Federated States of Micronesia" and "Burkina" instead of "Burkina Faso". You are also missing a bunch, like "United States of AmeRica", "Antigua and BaRbuda", "TRinidad and Tobago" etc.
Actually updating all these quizzes so after some time all these will be fixed thanks a lot in increasing their a accuracy. Actually I am still working on your previous comments.