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)
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Directed by: John Badham
Starring: Matthew Broderick, Dabney Coleman, John Wood, Ally Sheedy
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More mistakes in WarGames
David Lightman: [On the computer] Hello, are you still playing the game?
Joshua: Of course. I should reach Defcon 1 and release my missiles in 28 hours. Would you like to see some projected kill ratios?
David Lightman: Sixty-nine percent of the housing destroyed. Seventy-two million people dead. [Types into computer] Is this a game or is it real?
Joshua: What's the difference?
Trivia: Broderick changes school information from his home computer just as he does in Ferris Bueller's Day Off. Both mothers were also real estate agents.
Question: Since David told McKittrick that he thought he was only playing a game and at the time didn't know that he hacked into WOPR, McKittrick tells him that they're still on Defcon 4. Why would it still be on Defcon 4 instead of it going back to Defcon 5 after David confessed everything?
Answer: McKittrick doesn't believe David. He thinks he's covering for accomplices...most likely Russian spies.
Answer: The assistant to McKitrict explains that US is waiting to go back on DEFCON once the Russians do so.