In the whole episode, Romania is depicted as a monarchy with the king in a position that allows him to make political decisions. However, Romania ceased to be a monarchy in 1947. By the time depicted in the episode (circa 1997), Romania was a republic and its head of state was the president. Members of the ex-royal family did not hold any positions in the Romanian government and were certainly not authorized to represent Romania in international events.
When Harm is landing the 747, there is a camera shot of Air Force One. (The Presidential seal which is located near the forward doors is briefly visible) There is also a scene immediately afterwards of vehicles following the plane on the runway. These two scenes are from the Harrison Ford movie, Air Force One.