The trailer shows the equilibrium at the start when a US marine goes missing and his family(wife and kids) believe that he is dead;the trailer then goes on to show the marine's brother who helps his brother's family and eventually becomes close to them,this is when some of the disruption is shown because the marine turns out to be alive and is coming home back to his family which complicates many things because the family have somehow grown attached to the brother of the marine and forgotten about the marine.
The sound/backing tracks of the trailer is a mixture of sad and thriller as it fits in with the genre,this relates to the uses of gratification as it may match how the audience are feeling towards the trailer/movie and what their mood is.
We may also see Binary opposition in the trailer because there are two brothers are are fairly different in many ways such as one of them has a temper and the other is calm and firm which shows differences in them both even though they are brothers.
The trailer represents reality as to what may or has probably happened in real life;It shows us how quickly changes can happen and what effect it has on us overall.