The gun, used by The Indestructible is actually an air soft gun that was loosely based on both Llama-M82 and Llama-M87. The least one was Léon's main sidearm through Léon: The Professional (1994).
Mark Vetrov was offered the part of vampire but declined. He appeared in Bez fonarya (2010) shot on the same day and also worked on a film as a crew member, though.
Shot on the same day as Bez fonarya (2010), in the interior of Hotel "Ekonom" in Donetsk, while Bez fonarya (2010) in the exterior.
Shot during the second (and the last one) film festival "Drugie Territorii" ("The Other Territories"), in Donetsk.
Shot in 2009 but not edited due to post-production being postponed in favor of another projects.
Mykola Yeriomin: As the voice of the burglar. Recorded on set while filming, not dubbed. He also did some mosquito vocalizations.