Strip tease bar scene, woman or women are topless and wearing tong-like underwear.

A man sticks his penis in a box of popcorn. It is implied and not seen.

5 uses of fuck 3 uses of shit

Around 4 f-words, some sexual dialogue.

Set in 1959, some characters smoke.

A car accident occurs (but staged for laughs by a character).

Overall film would be a "light R" rating at most for brief language.