Factual error: At the end of the movie WOPR tries to crack the launch-code using brute force. So far so good. When WOPR finds out one digit of the 10 digit code, the first digit locks and the search goes on with the remaining 9 digits. Then he finds the second one, it locks too and so on. Problem is, brute force doesn't work that way. It would be too easy (26 letters and 10 numbers = only 36 possibilities for one digit). Brute-Force works only "all or nothing", you can't sneak your way to the whole code one by one.
WarGames (1983)
Ending / spoiler
Directed by: John Badham
Starring: Matthew Broderick, Dabney Coleman, John Wood, Ally Sheedy
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
More mistakes in WarGames
David: What kind of an asshole lives on an island and he doesn't even have a boat?
Jennifer: Maybe we can swim for it. How far do you think it is?
David: No, it's uh, 2 or 3 miles at least, maybe more.
Jennifer: Well, what do you say? Let's go for it.
David: No.
Jennifer: Come on!
David: No! I can't swim
Jennifer: You can't swim?
David: No, I can't. Okay, Wonder Woman? I can't swim.
Jennifer: Well, what kind of an asshole grows up in Seattle and doesn't even know how to swim?
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."
Question: How could WOPR not know the difference between a game and real life?
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Answer: While merely speculation, the WOPR is not alive and knows only what it's been programmed to do. It would have no concept of life or death, and as such would see no difference between the simulation and the real thing. That being said, an easy way to make it see the difference would be to program it to not waste physical resources. It would then see the use of all its actual warheads as less desirable.