The Day After (1983)

Revealing mistake: When Denis runs out into the field after the nuclear attack, she brushes up against a dead cow, and the cow moves like a stuffed prop. Real cows are much heavier than that.

Denise Dahlberg: Phones working?
Stephen Klein: Are you kidding? There aren't going to be any phones.

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