28 Weeks later trailer notes

Micro Analysis

Most of the shots are short close ups. This makes the film seem more action packed as the pace is constantly moving from shot in a very short space of time. Also it compacts the trailer to make it shorter for advertising purposes. There are several long shots to show the environment the film is set in (desolate London).
The sound used is generally calm then loud to create an erratic mixture of sounds. This builds suspense and then surprises the audience. Also when the army general says a pivotal line all the music and sound stops. This adds emphasis on what he says.
The pace of the clip afterwards is a lot faster , with faster music and shorter clip lengths. This creates the effect that the pace has got faster and the action has begun.