When Ross is taking photos of Chandler at the party, there are a few times where after the flash you can see that Chandler is in a different place/position.
Near the end of the episode when Max tells David "[Minsk] won't be the same without you" the audio is about a second ahead.
When Max tells Phoebe that he and David are going to Minsk, he tells her it's in Russia. It is, in fact, the capital of Belarus. Moreover, Belarus has been independent from the Soviet Union since 1991 (three years prior to this episode).
Max says that Minsk is in Russia, but it's actually the capital city of the country Belarus.