The Day After (1983)

Other mistake: When the Soviet attack occurs, farmer Jim Dahlberg carries his blinded son to the farm's shelter. The dust cloud from the nuclear blast in this shot is blowing from right to left, yet the flag in front of the house is blowing into the opposite direction. (00:59:50)

First Air Force Officer: Confidence is high. I repeat, confidence is high. Roger, we've got 32 targets in track and 10 impacting points. I want it confirmed... is this an exercise? Roger, copy. This is not an exercise.
Second Air Force Officer: Roger, understand. Major Reinhardt, we have a massive attack against the U.S. at this time. ICBMs... numerous ICBMs... Roger, understand. Over 300 missiles inbound now.

Trivia: The US department of defence did not allow the producers to use stock footage of actual mushroom clouds so they had to rely on special effects of the time, which is why the clouds appear so fake. They also wanted the script changed to state that the Russians started the war.

Mercury