This screenplay is so well executed. In fact, without it, this would have been another 'War of the Worlds' (but that is another story for another day). Screenwriters Scott Frank and Jon Cohen really ran with the short story that this film is based upon. It is the script that keeps the film chugging along at a perfect pace. Steven Spielberg works with this script to execute a film version of the page turner. Pace is so difficult to master in screenwriting. Here is an example of how it should be done.
The blue sepia look is perfect for this futuristic world. The best casting decisions are Max Von Sydow as the apparent nice corporate guy; Colin Farrell as the apparent douche evil guy; and Lois Smith (a role also easily played by Angela Lansbury). It's gratifying to always hear of a simple short story that turns into a major successful project. This was sci fi as it should be done.