Examine three films from any single genre and determine whether there is evidence of significant variation from one film to the next

To what extent does this variation indicate an evolution of style, structure, or content in the genre? What forces influenced or guided this change? Note: I don′t have any movies in mind, so the writer is free to choose any films to write about. Also, PLEASE AVOID BIAS OPINIONS -Try to provide an objective analysis and include any departures or issues that can be pointed out in the production of the film.