The document discusses various codes and conventions commonly used in film opening sequences. It outlines several elements film openings typically include to engage audiences and set expectations for the genre, such as logos from major film studios, title graphics that convey the film's title and credits, the use of sound, imagery and details to establish the setting and introduce characters, as well as narrative devices like narration, enigmas, flashbacks and action scenes to draw viewers in from the start. The document provides examples of how different techniques are employed to quickly orient audiences and pique their interest in learning more about the film.