Here's a good analogy for the movie. Imagine that the hubble / shuttle and each of the two space stations are actually ships in the ocean. When you're in a spacesuit you're in a little dinghy paddling with oars. Thus there are only 3 ships in all the oceans, each operated by a different country with no coordination as to their positioning, yet miraculously they are all so close together in the vast stretches of the ocean that you can easily row from one to another.
Even then, the analogy still doesn't begin to do justice, because orbits are all about motion and not position, and are 3D with elevation, inclination, etc, etc, as well, so there are even more "places" to be than the entire expanses and depths of all the Earth's oceans.