Best sci-fi movie trivia of 1983
Trivia: When filming ROTJ, Lucas didn't want anyone to find out that they were shooting the third Star Wars movie, because pandemonium could break out. So when someone asked the crew what they were filming, they said "Blue Harvest". All of the crew had shirts and hats that said Blue Harvest on them. The fictitious film's tagline was "Horror beyond imagination."
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.