One of the most important messages in this movie is letting go of words that rile you up -- not taking the bait when bullies try to demean you. It's good for kids to learn that words, although they hurt, don't need to catalyze you to do self-destructive things. Marty finally learns this lesson at the very end of the film. Doc's decision also shows that in the end he values love over all else.
Violence is all Wild West-style: there are barroom brawls, a shoot-out at dawn (well, 8 AM) and other old West violence, none of it particularly nasty. The Biff ancestor is aggressive and likes to push Marty and his ancestor around -- shooting at Marty's feet. When he first arrives in the Wild West, Marty encounters a group of horse-mounted Indians riding toward him with guns and arrows. In one brief scene, Marty is shown with a rope around his neck, as if he's about to be hanged -- until he's saved.
A couple of kisses but mostly there's a lot of longing looks between Doc and his love interest. In one scene a man makes a reference about what a woman "could do worth $80," which a child may not understand but clearly alludes to sex. Marty and his girlfriend Jennifer also exchange a couple of heated kisses.
Some stronger words than usually heard in PG movies: "bitch," "assh--e," and "s--t," as well as mild insults like "damn you to hell," "chicken," "yellow," "coward," "lily livered," "gutter trash," and more.
Marty wears Nike sneakers, the discontinued sports car the DeLorean is of central importance.
Drinking, Drugs & Smoking
There's drinking in the town saloon that is shown a few times. Only men are shown with drinks in hand.