Continuity mistake: When Superman flies to save the girl inside the tornado and the family exits the basement there's a truck by the entrance door filled with hay. Half a second later the truck is gone and reappears behind the family, but now it's empty. (Laserdisc and international extended editions).
Factual error: The Russians launch a missile which stands upright on a truck. The energy needed to send it beyond the atmosphere would need such a huge fire blast that it would've caused a big explosion when in contact with the truck's petrol deposit.