Common Sense Note
Parents need to know that Richard Pryor's Gus Gorman is as much of the main character in this movie as Superman. Therefore, expect some of the "loveable" con-artist antics that made Pryor famous in his R-rated films, including drunkenness, theft, avoiding honest work, and even letting a swear word slip out. It's all suitably rendered PG-mild, though.
A villain's girlfriend/mistress is usually in tight, revealing clothing. Superman, slightly warped by Kryptonite, spends the night with her.
Strenuous fighting between super-beings, but no blood. Missiles and lighting bolts are repeatedly fired at Superman. Jimmy Olsen falls, suffers a fracture. One character is turned into a Borg-like cyborg, but reverts to normal.
A few curse words.
The movie's scene-stealing guest star, Richard Pryor is thieving and helping the bad guys one minute, admiring and helping Superman the next. Rendered "sick" by imperfectly synthesized kryptonite, a surly, evil Superman commits mischief, vandalism, and causes an oil slick. There's a clear victory for the "good" half of his personality, though.
Tie-in to vast quantities of related merchandise. Lots of product labels appear, including Kentucky Fried Chicken. An attack on Superman literally turns into a vintage Atari video game.
Drugs / Tobacco /
The 'evil' Superman gets drunk right in front of the shocked citizens of Metropolis. Another character, described as a washed-up high-school athlete, is perpetually sloshed and hostile. In both cases, these activities are disapproved of. However, Gus Gorman gets comically drunk (and tricks a guard into a drunken stupor) to gain access to a computer.