The document summarizes the key features of a theatrical film poster and their purposes: 1) The tag line provides insight into the film's plot to create suspense and curiosity among audiences. 2) The large film title is the main branding and needs to catch viewers' eyes so they remember it. 3) Featuring famous actors as the unique selling point can attract audiences from their fan bases. 4) The release date informs viewers when they can watch it in cinemas so they can plan accordingly.