The document discusses techniques used in three film trailers that the author found effective and wants to experiment with in their own film trailer making. These techniques include using narration at the beginning to set the tone, incorporating changes in music to develop the storyline and show character development, and using point-of-view shots to convey whose perspective the film will be from. The author also notes how What's Eating Gilbert Grape surprised audiences by telling the story from the brother's perspective rather than the disabled boy's.