Factual error: When Kruschev and Vasy go to the press meeting the Soviet National Anthem is playing in the background. The actual anthem was not written until January of 1944, a year after the Battle of Stalingrad. In addition, the song sung is the 1977 lyrics. The lyrics used in 1944 were slightly different. See http://www.skazka.no/anthems/ for more info.
Trivia: The film is based upon William Craig's book of the same name, yet the entire movie is based upon a sniper duel that covers no more than two pages of the entire book. German army historical records never mention an elite sniper named "Major Koenig" hunting Vassili Zaitsev at Stalingrad.