intertextuality is when a film copies a certain scene from another film, not only can it be the scene but it can also be the camera angles, costumes, type of lighting and props. 

The scene that some films get ideas from is the famous shower scene in the film 'Psycho'. Many films has copied this by someone getting murdered in the bath tub, the type of clothing that the protagonist wears, the setting of the bathroom and the type of knife used.