Intertextuality is a term to describe the visual referencing between films. Quite literally films 'Borrow' from each other and you may recognise certain camera angles, aspects of mise en scene, snippets of sound or methods of editing in some films that you have seen in others.
Intertextuality is usually done depending on the genre of the film. Many horror films for example tend to borrow the opening of a 'haunted' houses and the wheather being 'a dark and stormy night'. Intertextuality is interesting because it is a good way in which you can incorporate ideas that have been already used in previous films. I really like how Alfred's Hitchcock's Psycho shower scene had been used in lots of suspenseful movies such as: What Lies Beneath, Fatal Attractions, The Stepfather, Succubus. This makes it a very recognisable scene and will probably be commented about by many. Aspects of the film 'Psycho' that was borrowed where commonly the scenes shot in the bathroom. Directly targeted at the shower with high angle camera movement of water running from the shower head. The sinister music played on set that makes it much more suspenseful and engaging. Furthermore the interaction between a male and female actors,the idea of death and struggling to fight one another off where used in all three films.