Big error at the end (spoiler)
After the Russian drills the hole, opens up the mammoth graveyard, and eventually falls in, we see him with flies all over the mammoth carcasses. Are we honestly supposed to think that flies were able to live and breed in sub-freezing temperatures? There's no way that such a thaw would be able to take place within an enclosed glacier like that.
~After enjoying that movie, I figured I would drop by IMDB to read about its problems.