When Zuchov and Austin are told of Irina's disappearance, the national emblem behind the general is that of DDR, eg. East-Germany, not a Soviet one.
When Steve is clearing away rubble, a "rock" hits him on the head with no reaction.
When Irina crawls through the laser-beam-protected doorways, parts of her body rise higher than the doorways' lowest motion-sensors several times.