2.

In simple terms there are five rules to Postmodernism. These are;

1) Playfulness and self-reference: Postmodern text do not take themselves seriously, a rapture of verisimilitude (breaking of the truth), these texts are self-aware and often remind the audience that they are just films and include ironic undercutting (more or less taking the piss).

2) Intertextuality: This includes generic blending, explicit references (naming/describing another piece of text, whether this is a film, a book, or even a product, these references are obvious) and implicity references (subtly references to another text, an example of this could be a director using the exact same shot in their film as is used in another) and the death of the auteur (this being the death of the author, there is the acceptance that nothing is original, influences are everywhere)

3) Popular Culture VS. High Culture: This really refers to where Postmodernism finds its influences; it avoids value judgement - having no qualms about borrowing from an opera/ theatre (High culture) or going as far as to borrow from a music video (popular culture) and a 'pick and mix' approach - they'll steal from everywhere.

4) Fragmentation of Representation: The acceptance that everything is a copy of a copy, of a copy', the destruction of simplistic, singular representations (nothing/no one is a singular representation), this makes people more 3D.

5) Uncertainty and loss of context: Usually postmodern texts force the audience to answer major and usually philosphical questions, such as; what is truth? what is real?.


Another aspect:
The Death of Meta Narrative: this deals with major concepts, such as good and evil, right and wrong etc.