Near the end of the film when all the astronauts are back on planet Earth (the bit where Bruce Willis goes to tell the bad news to Liv Tyler), the Russian who has been aboard the space station for a few months (they didn't say exactly how long) walks perfectly. As most people know, it takes time to be able to use your limbs again after being in space, as you are not exercising and because there is no gravity in space.

Yet this Russian seems to be able to walk freely without any help after all that time!