Common Sense Note
Parents need to know that there is an abundance of obscene language, the F-word most prominent. Violence gets pretty severe too. In a flashback (which may not reflect actual events) children and a mother are murdered by their own husband/father. There is an overwhelming sense of film noir-style corruption, and even the police don't look terribly clean.
Sexual
Content
Characters tell off-color anecdotes.
Violence
Brief, stylized flashbacks of a rape. Characters beaten, shot at close range and in the head. Gasoline poured on an occupied police car, set on fire. A mother and children are murdered in a flashback.
Language
Lots and LOTS of swearing, especially the f-word, plus just about every other profanity from time to time.
Social
Behavior
Nobody here is very noble, with just a hint that cop-turned-crook Dean Keaton was on the verge of mending his ways for his girlfriend's sake (but didn't). Even the police are portrayed as internally corrupt and bullying, using threats and intimidation on suspects.
Consumerism
Not applicable
Drugs / Tobacco /
Alcohol
Characters smoke -- even through their stocking masks. Mentions of cocaine and other narcotics in terms of underworld drug deals.