In every episode with David the scientist guy, he or Phoebe or other guys are reffering to Minsk as it is in Russia, even if it's not, Minsk is in Belarus!!! It's a pretty big mistake, maybe like saying that New York is in Mexico. The writers should first make sure, that they know where the certain cities are. It's not that hard.
Belarus wansn't independant until 1990. It was technially in Russia until then. MOST people still concider it a part of Russia because of that. I don't think this is a huge misatke