When Anya is called by an unseen man, she starts slowly pacing towards the entrance of the room where the voice comes from. The scene cuts to another one in black and white, showing her entering the room. On the previous scene, the left foot was the one to advance, but after the cut it's the right one advancing, being this more evident by the fact that she trips over the entrance.
When attempting to escape from the mold creature Anya is in the background with her arms at her side as she is standing next to Major Sergey Mikheev. In a cut to just the two of them, she has one arm crossed in front of her with her hand resting on the Major's arm. Cutting back to the shot with her in the background both her arms are at her side again.
Peter states they decided to bore the hole in Kola Peninsula 'saving a year because of the abnormally wide layer of permafrost'. There are only sporadic patches of relatively thin permafrost in Kola region and drilling through frozen ground is probably slower, not faster.
Plastic jumpsuits and gas masks aren't much of protection against 200 degrees (probably centigrade in Russia) heat as stated down the shaft. They seem to have a backpack containing a cooling system of sort, but one would really need a thermally insulated suit like a space suit.