All the public signs in the unnamed country where this takes place are in the international language Esperanto, and some of the country's officials briefly speak Esperanto when talking to each other.
In this unidentified generic fascist country, the signs are in Esperanto. For example, "Havena Polico" is Esperanto for "Port Police."
Released on 1 September 1939, the day WWII started in Europe with the German invasion of Poland.
This film has been preserved by the Library of Congress.
The plane that is used to escape the country in the final scene is a Beechcraft Model 17 "Staggerwing".