Continuity mistake: Near the end of the movie, the panel has JPE 1704 TKS showing, but when Joshua finds the launch code, CPE 1704 TKS is blinking on the screen.
The hacker gets the computer to stop blowing up the world by telling it to play tic-tac-toe so the computer will realize that there is no winner in a nuclear war.
Rob T Firefly
Stephen Falken: The whole point was to find a way to practise nuclear war without destroying ourselves. To get the computers to learn from mistakes we couldn't afford to make. Except, I never could get Joshua to learn the most important lesson.
David Lightman: What's that?
Stephen Falken: Futility. That there's a time when you should just give up.
Jennifer: What kind of a lesson is that?
Stephen Falken: Did you ever play tic-tac-toe?
Jennifer: Yeah, of course.
Stephen Falken: But you don't anymore.
Stephen Falken: Why?
Jennifer: Because it's a boring game. It's always a tie.
Stephen Falken: Exactly. There's no way to win. The game itself is pointless! But back at the war room, they believe you can win a nuclear war. That there can be "acceptable losses."
Trivia: Closely listen to the TV playing in the background, when Mathew Broderick comes home from school, before all his trouble starts with the Feds. The local news is on, and is saying "a fire broke out in a prophylactic recycling factory."
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