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.
Factual error: Donna jumps off the bridge (which is relatively low down), into shallow water. She then narrowly avoids being hit by a huge ocean liner. There's no way such a huge ship would be in such shallow water - for starters, it couldn't cross under the bridge, being far too big. (00:03:12)