Microstates (Free City of Danzig, San Marino, etc.) missing
This is 1936, and Finland has post-Winter War borders. Give them the Russian-Norwegian border as well as everything west of Lake Ladoga.
Internal (colony) borders in places like British Raj and West Africa not historical
Xinjiang and Tibet's shapes are not correct, as well as Timor (island)
Chinese clans like the Xibei San Ma and Guangxi Clique missing (This is CLEARLY based off Hearts of Iron IV, so I pointed this out)
Many colors are not correct for Hearts of Iron as well. Some of the oddest colors include Albania's olive green, Siam's hot pink, and Brazil's pinkish gray.
This is not a mistake per se, but adding labels (maybe even adding cities) would be fantastic.
There is this small microstate (on the coast of the Black Sea, Bulgarian-Turkish border), that owns Antarctica (it can be the other way around, or maybe it is a coincidence), that never existed in history.
idk how but you should make it so that armies can die if they are encircled (if no neighboring province is owned by them)
And also you should make it so that you shouldnt just rely on the capital. I had yellow one game unite most of japan (purple just controlled the southeast island) and purple took the capital of yellow and yellow just... died? even if they had the rest of japan