1. Thriller film trailers use several genre signifiers to target their audience and build tension. These include dramatic music, diegetic sounds like heavy breathing or footsteps, and non-diegetic voiceovers that build suspense. 2. The characters in thriller films are often older men and women rather than teenagers, and the films are aimed at audiences 16 and older. 3. Enigma codes and plot dilemmas are used to engage the audience and leave them questioning what will happen next.