Intertextuality

Vonnegut uses a method of repetition throughout the novel. He uses this style as a tactic to let the reader learn the story little by little and in an unorganized way. He is constantly mixing the order of the moments and different characters appear in different chapters so he is always "playing" with time and people to get his point through to the reader and to mess with him. Every time he mentions a person, restates something that he had already mentioned in the past plus he introduces a new fact. Another thing Vonnnegut does is that he includes and mentions other works in his book to add support to his content.
Other than mentioning songs and rhymes, Vonnegut also mentions other artists, writers, and important people to add to the books tone and mood. The works he mentions obviously relate to the experiences he has lived and is now telling. He also uses them to support his strange ideas and to explain some concepts. For example, he mentions Kilgore Trout and he talks about his science fiction novels which support Billy's ideas about religion and ETs and that's why he is like his number one fan. He also uses a Dresden book to explain some of the things that happened and to give like facts and not just his opinion. "One of the books that Lily had brought Rumfoord was The Destruction of Dresden, by an English man named David Irving." (p. 186) Afterwards, in the book, he gives a small passage of this book and through it he states some facts of the war in Dresden which are useful because they're not opinions but facts so one can get an idea of what happens and the real magnitude of the situation. So Vonnegut uses the inter textual method to get across many points and to give the reader something to relate to so that he gets the point.