Conventions of trailers

• A trailer usually begins with the logo or logos of the film's production company or production companies. The logo is commonly edited in a way so that it fits visually with the genre or mood of the film.
• Like at the start of a typical scene in a film, it is common for a trailer to show an establishing shot almost immediately. This gives the audience a visual starting point of the story as told in the trailer.
• The film's age certificate from censorship boards such as the BBFC is shown towards the beginning of the trailer.
• The director's name, and sometimes other notable members of the film's crew, is usually displayed at the beginning of the trailer. 
• If the film has won awards, they are usually mentioned early on in the trailer. By emphasising the film's decorations, the audience's attention is more likely to be held for longer as proof of the film's success has been presented clearly. 
• Text is often shown throughout the trailer which perhaps highlights different themes or plot points of the film. 
• Non-diegetic music is often played in the background to captivate the audience and to perhaps reflect the pace or mood of the film.
• A non-diegetic voiceover is often played over the top of the trailer and is used as a guide for the audience, i.e. to outline basic plot points.
• Name captions of the actors in the film are usually shown towards the end of the trailer and are displayed in the same font and typeface as the title of the film to maintain continuity. 
• Trailers usually run for around 2-3 minutes.
• The film's release date is usually displayed at the very end of the trailer. 
• The billing block is also displayed at the very end of the trailer.