The 50s, the 60s, and the 80s and the climate at the time of the film. Star Wars (but not that Star Wars).
Gatling and the Gatling Gun, Alfred Nobel and dynamite, Tesla and his particle beams, and…. nuclear weapons?
Text-To-Speech. Voder at the 1939 World’s Fair. Matthew Broderick’s computer. WarGames computer graphics and rendering radar screens.
Teaching computers to teach themselves. The point where this movie steps into scifi territory.
Dinosaur extinction hypotheses at the time of the film. Falken is a psychopath.