The document discusses several elements of horror genre films including characters, plot, props, sound, location, and costume. It notes that horror trailers typically introduce vulnerable characters that become victims of an evil character. The main plot involves the evil character killing the vulnerable ones. Props and weapons shown in trailers can hint at how the killer commits murders. Horror films also use dialogue, music, screams and memorable lines from evil characters for sound. Location and costume choices can impact the realism and scare factor for audiences.