Audio problem: When Jennifer gives David a ride home near the beginning of the movie, you hear David's dog barking. In the next shot, we see the dog is running down the front path and it barks a couple more times. Look closely at its mouth, it's not barking.
Audio problem: When Jennifer gives David a ride home near the beginning of the film, as David gets on her bike, she looks round and tells him to "Hop on" without moving her lips. (00:18:20)
Audio problem: In the scene where the plane carrying Matthew Broderick is landing in Oregon, the plane shown landing is propeller driven. The sound effect is a jet engine aircraft.
Answer: They were erroneously alerted that an actual nuclear attack was underway, and they had been trained to respond by firing a nuclear warhead. However, one was unconvinced that the US was actually under attack, and he wanted further confirmation from his superiors. The other insisted that they follow protocol and fire the missiles. One man alone cannot launch the missiles, it takes two, and the one with the gun is attempting to force his partner to follow through on launching the weapon.
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