The following flags only exist in the October 18, 2016 prototype:
The flags from the original game are present here as well but unused, compressed differently.Only exceptions are Argentina and Paraguay which instead have their respective MK8DX versions albeit compressed differently.
The following countries lack flags in the game but have their names display:
Antigua and Barbuda (has flag in October 18, 2016 prototype)
Anguilla
Bahrain
British Virgin Islands
Cayman Islands
Costa Rica
Dominica
Grenada
Guyana
Hong Kong
Haiti
Macao
Montserrat
Netherlands Antilles*
Niger
Saudi Arabia
South Africa
St. Kitts and Nevis
St. Lucia
St. Vincent and the Grenadines
Taiwan
Turks and Caicos Islands
Uruguay
Up until circa March 2019, Iceland had the unique distinction of having a flag despite not being available.As of May 31, 2023, Russia has this distinction (in this case it's the reverse, it used to be available but was later removed for geopolitical reasons).* Netherlands Antilles, having a leftover MK8U flag in the files, was available in the Nintendo Account settings at launch, but was delisted after August 2017.