Continuity mistake: When Val goes into the Russian building to take the micro-chip he changes to a drunken Russian man and then to a tourist in the space of a few minutes, but when they show him as a tourist he had stubble on his face and that would not be possible to produce in such a short time.
Factual error: Simon recovers awfully quick from the effects of hypothermia. In the hidden room, he is shaking like a leaf and can barely speak. Even when the old woman shouts where they are, he still looks a bit out of it. However, once they escape into the underground tunnels, he appears to be in perfect health and shows no signs of discomfort for the rest of the film.