The document discusses how different elements are used in the opening sequences of thriller and romantic comedy films to set the genre and tone. In thrillers, close-ups are used to conceal identities, the music is slow and ominous initially before building urgency, and the editing starts slow but speeds up. Meanwhile, romantic comedies use longer shots to show characters, more upbeat music reflecting the mood, and normal paced editing without urgency. Overall, the opening sequences aim to represent the genre through visuals, audio, and editing techniques.