1) Horror comedy films often use conventions like violence against evil characters, comedy during serious moments, and romance that ends badly. They focus on survival as the main characters flee from threats.
2) Trailers for these films commonly feature weapons, dead bodies, and isolated settings to set an ominous tone with humor added. Low-key lighting creates an eerie atmosphere.
3) Editing techniques like changing pace and fade to black transitions heighten tension and suggest danger, while shot reverse shots contrast characters. The openings introduce characters and locations before mixing scary and funny elements.