The document discusses the conventions and technical elements of movie trailers, including displaying the cast, using montage editing, release date, and production company. It notes that trailers indicate the target audience through ratings like U or PG. Additionally, it identifies different types of trailers such as main trailers that are 2-3 minutes and teaser trailers that are about 1 minute. The purpose of a trailer is to encourage viewers to pay and watch the film in cinema.