Nicole Kidman-The Invasion Exclusive Trailer

How this trailer fits the codes and conventions of a horror film.

Sound
Sound of police and ambulance sirens has been amplified/ enhanced. The really gets across this idea of the situation being an emergency.
The sound is synchronous and non diagetic. This really heightens the atmosphere and makes it even more intense.

Editing
Slow motion as they are entering the tent helps build tension as you anticipate what's going to happen next.

A dark filter has been used over all to really add to the dark feel.

Jump cuts have been used to create a sense of not knowing what's going on, not only making you want to find out by going to see the film, but it also creates a very uneasy feel, as we don't know what's happening so we don't know what's going to happen next adding to the element of surprise.

Camera
Pan used to create disorientation.

Mise en scene
woman and child used as the main characters which is typical of this genre, as women and children are viewed as most vulnerable.