Conventions of a Trailer

-Trailers can sometime involve footage or moments in the film that are actually not included in the actual film. For example showing some spectacular 3D CGI that is not featured within the films itself.

- Trailer almost always include a title sequence and information which includes stars, directors, producers, release date and technology I.E. 3D or 2D. 

- Major stars will be mentioned early in the trailer because they will often make fans of that star, want to go see that movie or not. 

- Often movies will be linked with the director because they have directed films that have been previously popular or liked. For example 'by the creators of...' 

- Blockbusters often have epic 'movie man' voiceovers that tell small amount about the film.

- Trailer scores and trailer soundtrack or music are almost always used to show the genre of the movie and to tell if it is a comedy a horror.