The trailer starts really fast with fast pace and this is one the most common trailer convention as we see it with Ill manors as well the trailer has fast pace and it tends to slow down as we get into the trailer.  The track in this trailer is parallel to what's happening in the trailer which is pretty messy and chaotic and the track represents what's happening in the trailer.  After we see a close up of Leonardo DiCaprio which shows that he is the main actor as the audience will want to know and people will be more interested as Leonardo is very popular and has a massive fan base and this is another important convention that they have imputed because more trailers do have shots of the main actors as it could determine if the neutrals watch the movie when it comes out.  Also we see other names the likes of Jonah Hill who are very popular in the industry and we don't see the unknown actors which is very understandable because these people aren't know well in the industry so it's very important that we see the names of the main starts because it could attract a wider range audience because these 2 men are very popular.

Both Jonah Hill and Leonardo DiCaprio did interviews for the Ellen show which is a family show where she interviews musicians, actors etc.  Leonardo DiCaprio talks about the movie and his style is more serious because he discusses the movie and that's really it. Also he talks about some of his older movies which a older audience will know about because they're aimed at a older age because most of his movies are a 16 or a 18.  With this is interview is about the movie because Ellen is talking about the movie and the performance of Leo which is promoting the movie because the people watching will want to see his performance. On the other hand Jonah Hill has the comedy aspect because younger audience will be familiar with him because he's been involved in movies which are targeted at a younger age: Superbad and 21 jump street so he adds some comedy as he's a funny man in the industry.  He talks about his desire to work with the director and many teenagers could relate to this because younger people might have desire to work with a upcoming director just like Jonah Hill did. The movie is being promoted as Ellen talks about his performance and how he suited the role.