The opening sequence of 21 Jump Street establishes the film as both an action and comedy genre. Scenes showing police uniforms and vehicles indicate it is an action film, while close-ups of the actors' comedic facial expressions reveal the comedy elements. Colorful shots of red and blue are used to represent the police, and close-ups of bullets, money, and chemistry props provide clues about the crime and plot elements in the movie. The sequence introduces the directors and producers and aims to give the audience a sense of the impact and mixed tones they can expect from the film.