A good guy wears white or a bad guy wears black. Three times if someone hovering in between wears gray. Every time you find yourself talking to the people on screen. An elaborately made up alien has no lines. Someone or something tries to get money from Han.
Some ship crashes into something after being hit.
An Ewok dies, and the camera lingers longer than it did when the Death Star exploded, killing billions of people. It is Luke's destiny. Luke discovers a long-lost relative. Luke fights monsters or savages. Luke does some nifty acrobatic flip.