Postmodern Elements of Inglorious Basterds

Quentin Tarantino uses alot of postmodern elements within his films, and Inglorious Basterds is no exception.
The film opens with 'once upon a time' and is split into chapters, this is not a convention you would typically associate with a War film, however you may expect to see it split up into dates/years. This element connotates that the story is a fairy tale and possible made up, which some of it quite clearly is, yet the idea is that you believe this happened during WW2.
In the first scene there is an intertextual reference from one of his other films 'Pulp Fiction', where he uses painted back drops as apposed to real ones, this like the getting ready scene with Shosanna in the cinema where the set is revealed is obviously used to show that it is only a film and however WW2 was real this film is not.
The music used in Inglorious Basterds is also postmodern. The use of italian composer, Ennio Morricone's music was used not only for the film but featured on the soundtrack aswell. There is music from Westerns during the film aswell, this also doesn't really fitt with the War genre of the film these elements could also be used for humour during fight scenes. This is completely contradictory of the genre of this film.