The document discusses conventions used in the opening of a psychological thriller film. It describes using non-diegetic music to build tension, as seen in films by Alfred Hitchcock, as well as including close-up shots to engage the audience with the main character's facial expressions. However, it also discusses deterring from conventions briefly by using a calm soundtrack before ramping up the tension. This is intended to catch the audience off guard and enhance the tension-building effect of the music.