Plot hole: Why is David the only one aware that the computer is still playing the game? The NORAD people should have been aware the "simulation" was still running including the countdown. They believed the Soviets were really carrying out troop movements and bomber attacks over Alaska, did they never once look at the screen telling them "game time elapsed/remaining" and conclude none of it was real?
Suggested correction: They didn't see what they didn't expect to see. There's a saying that goes something like, "The answer was staring me in the face the whole time." This means that it's easy to miss something that might otherwise seem obvious. The concept of it not being real was completely alien to them, so even if they had seen it, they'd have simply dismissed it.
Other mistake: When Jennifer meets David in Oregon she says she drove 3 hours to get there. In the next scene they are getting off a bus to catch the ferry. What happened to her car?
Suggested correction: There are possibilities off-screen as to why. It's possible that the bus used its own private road to get to the ferry which may be closed to the public, or the parking lot may have been too expensive and they parked on a street instead and caught a bus. It's not really known, but those are some possibilities.
