The document discusses various codes and conventions used in classic realist texts and postmodern media to represent reality and create believable fictional worlds. Some of the key codes mentioned include coherent narratives, plausible characters, linear storytelling, psychological realism in editing, and accepted conventions like dissolves to indicate passage of time. The document also examines codes used in different genres like news broadcasts, reality shows, police documentaries, and audience participation programs to suspend disbelief and immerse viewers.