The names used for the presidents of Lithuania and Latvia are Slavic. Lithuania and Latvia are the only two countries in the world that speak Baltic branch languages (Lithuanian and Latvian). They names are very different from any other countries names usually ending "-as", "-is" for male names and "-'unique letter to the alphabet'", "-a" for female names. The surnames are very different from any other countries (especially Russian, that are used in this episode) too.
Lithuania and Latvia are allies - both are members of NATO and neither of them have the war power to start any kind of war.
The Marine Corps guards are shown wearing Dress Charlie uniforms, with gold stars on their head gear. This is incorrect, the device on their covers should be the Eagle, Globe and Anchor.
Mitzy Von Schneiden is neither a Lithuanian surname or a Latvian name. "von" indicates a noble father's lineage in German. So she couldn't have a Lithuanian father or her surname would be more Lithuanian (like "Sudeikis", "Gedminas" for example).
The common adder is the only venomous snake in Lithuania. Only rarely do people die from their bites although there is more danger for people who are allergic to the venom.
Lithuanian president would speak Lithuanian. Latvian president would speak Latvian. Belarus president would speak Russian (even though Belarusian is second official language, there is a strong preference towards Russian in Belarus by the government). Even though Lithuanian is some what similar to Latvian, people of these countries usually don't understand one another is they are speaking their native tongues.
Just as well then, that their interpreters can be seen standing next to them, translating as the insults are flying.
Breaking News: the anchor is speaking about Belarus, but the background is the main square of Krakow, Poland, that has no connection to the plot.
When Walter, Paige and Happy go to the zoo, they attempt to steal an adder to make anti-venom. The simplest thing would be to break into the medical stores, as any facility that handles venomous animals, would have the correct anti-venom appropriate to the different creatures it holds..