Factual error: 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.
Continuity mistake: When Tom initially breaks into his studio, the "Hidden Agenda" photograph has a plaque underneath it. When he returns later with Dr. Bellamy, the plaque has disappeared.