Inside joke: In the dossier scene, the last photograph Briggs looks at - and rejects - is that of the show's creator, Bruce Geller.
Rogosh's personal name, Imre, is a common male name in Hungary, identifying him as probably ethnic Hungarian, if not a national. When he wakes up in "prison" his wallet contains what appears to be Hungarian currency. These details suggest that the "hostile country" is Hungary, although that nation was commonly held to be the least aggressive and most liberal of all the Warsaw-pact countries.
The plot bears some striking similarities to the 1964 motion picture 36 Hours (1964), starring James Garner and Rod Taylor. In both the motion picture and this episode, a prisoner is told that he has amnesia and several years have passed, so that he will believe it is safe to reveal secret information that, in reality, has importance in the near future.
The major semi-permanent interior studio set, extensively re-used with minor to major set-dressing for season one, is the huge set using large arches seen in the next few episodes as prisons, military or police station, and a casino. Note the arch shapes, and the 5 steps leading to a raised area.
By Briggs selecting the use of a Repertory Theatre/Theater group, within the Mission, this episode officially establishes that the IMF is a much larger organization, with a much bigger pool of Agents than the series generally focuses on. This could now also explain how so many Mission elements, such as building space, vehicles, costumes etc., are in place before the IM team commence each mission, with more agents already "on the ground".