Anachronisms: Even though episode no.7 is set in 1993, a big emblem referring to the 850th anniversary of Moscow is clearly visible. The 850th anniversary of Moscow, however, was celebrated in 1997.
Revealing mistakes: Towards the end of episode 13 we get too see a close-up of Phil's left hand. Even though he has been hospitalized in a full coma for several years, he has a suspicious amount of dirt under his fingernails. In reality a coma patient would hardly have the chance to get his fingernails dirty.
Revealing mistakes: At the very beginning of episode 15 Sasha reaches out to close the open eyes of his dead friend Bee. Bee, however, closes his eyes a fraction of a second before Sasha actually touches his face.