Common Sense Note
Parents need to know that this is a Superman story pitched on a more adult level. In addition to rampant violence and mass destruction of cities and machinery, people are killed (even animals and children, off-screen). Characters swear, at PG-level. Superman and Lois Lane have been "more than friends" (as Lex Luthor puts it), though we don't see them having sex. There is, er, super-nudity in a clinical setting, but shadows and amusing obstacles block our view of the, um, super-gear.
Nothing overt, but it's clear that Superman and Lois are lovers and cohabitate when they can. Naked male superbodies in cloning chambers have private parts obscured (rather amusingly, a la Austin Powers) by gravity-defying mounds of liquid.
Intense animated violence, to the point that Superman bleeds. Characters are killed, including (off-screen) a child. There are beatings, and (off-screen) heads are broken, spines are snapped -- animals as well as people. One character shot to death.
"Hell," "ass," "rectum," and the euphemism "frigging."
Superman could just let his astounding powers go to his head and become a self-righteous super-vigilante or demi-god, but he doesn't. We see this trait in others (Lex Luthor among them). Lois is fearless and smart, but she still needs rescuing almost continuously; ditto the less resourceful Jimmy Olsen.
Tie-in to vast quantities of related merchandise.
Drugs / Tobacco /
Drinking under duress by Perry White.