Common Sense Note
Parents need to know that this was one of the first movies to get the newly minted R-rating. There are lots of shootouts and a violent finale in a hailstorm of bullets that was compared by commentators to the Vietnam War (yes it was) for graphic bloodshed -- though far gorier movies have since arrived to "entertain." There is a glorification of the anti-social outlaw lifestyle (but an awareness of how criminals manufacture such myths themselves, for the positive PR), and the main characters smoke and drink. Bonnie is sexually frustrated (discretely topless in her opening scene) with Clyde, who seems to have intimacy-impotence problems (in the original script he was gay, or at least bisexual). Their bedroom dysfunction is a recurring theme, though it's coached in tasteful euphemism.
Sexual
Content
Bonnie is dressed only in panties in her introductory sequence, though camera angles and editing obscure her breasts. Bonnie and Clyde's unsatisfying sex life is a reoccurring theme; she's sexually hotwired, perhaps a nymphomaniac, and Clyde is possibly homosexual, but the script wraps these diagnoses up in euphemisms and evasive dialogue (Clyde saying he's "no lover boy").
Violence
Considerable shooting, as well as pistol-whipping and reckless driving. Once this movie was considered the utmost in graphic carnage -- though far bloodier movies have come along since. Nonetheless, we are shown blood-reddened bullet wounds (a rare thing in those days) and an infamous climax with a lethal hailstorm of ammunition.
Language
Pretty mild under the circumstances, with "hell" uttered a few times.
Social
Behavior
Plenty of glorification of the outlaw lifestyle here. The titular criminals are played by two good-looking actors who create characters that are a lot more sympathetic (and sexy) than the lawmen in pursuit of them, many of whom they kill. Two supporting characters sadly contrast their criminal lives with their religious upbringings (it may say something that these two are the weak links who will bring down the gang).
Consumerism
Mention of store names, products with mostly a 1930s vibe.
Drugs / Tobacco /
Alcohol
Lots of smoking. Some drinking and talk of drunkenness.