Literary Self-Reference: Five Types of Liar's Paradox

A character in a novel pulls a book from a shelf and starts to read about himself in a novel. Puzzling, but what does it really mean? Does it force us to fundamentally reconsider the nature of fiction? Does it turn the novel into a kind of liar's paradox? And what exactly is a liar's paradox, anyway? Does the liar's paradox, despite its name, have anything to do with lying? What, if anything, does the liar's paradox have to tell us about reality, beliefs, and fictional discourse?