The document discusses conventions used in film trailers and how the author's trailer challenges some of those conventions. Some key conventions discussed are the use of voiceovers, music, establishing shots, cuts between short clips, and green preview screens. The author's trailer challenges conventions by using long shots to establish scenes, unusual atmospheric music at the beginning, and including relevant statistics in captions. The purpose is to create more tension, mystery, and draw the audience in compared to typical trailers.