During the movie you get introduced to the DEW line (Distant Early Warning) and SAGE system. At one point the screen shows an F-89 which is intercepting the "missile." in the next ten seconds the screen shows the F-89, an F-86, an F-84, an F-94, and an F-100, all purporting to be the same aircraft.
This movie, while striving to be a Sci-Fi flick only manages to be a thinly disguised demonstration of how well the US was prepared for the unthinkable. While not great for action or drama, it does show video of the various types of aircraft and air defense hardware available at the time. They even show the Nike Missile System. It also explains, in words the civilian could understand, what each part did. You will see Hawker Hunters, Canadian CF-100s, B-52s, B-36s, B-47s, F-102s, and more.
You can also see the thorough (NOT) understanding of radioactivity that the writers had. The hero dies because he was within a few feet of some plutonium unprotected. It is something that can be chuckled at now, but it must have been scary then.
You can see it all on hulu right now. It is definitely worth a viewing for those of you interested in Cold War History. Enjoy!