A prophetic movie!
The scene in the lab, where Leigh Taylor Young puts the headset thing on Finney made wince, because a similar technology actually exists. I once saw on the news, that a company has created a machine which checks someone's attention while they do an indoor driving test. This equipment can follow their eyeball and record where they look while driving, and is used for research and to teach people to drive more safely. I cannot recall the name of it, perhaps some good person here knows.
Also, the use of CG superimposed background sets, is now commonplace on most news channels around the world.