Capital Punishment is now illegal in PNG, the smallest denomination coin is also not phrased very well because it sounds like it's referring to currency globally.
Great quiz but can you please specify in the Japanese Empire question that it includes overseas territories, because I knew that they only invaded Christmas Island and I assumed it doesn't count considering it's an oversea territory.
From wikipedia: "Chrismas Island is an Australian territory in the Indian Ocean...." Your assumption that it wouldn't be included in "current territory" is your choice but not one that I would have expected.
You still should clarify the question. Just write "Any part of its territory..." or something along those lines as its only a minor fix. Its like saying the UK was invaded by Germany in WWII. Sure you might be correct on a technicality (Jersey etc.) but thats not what people think of when they here invaded