Think about the literary style of the book - there are no quotation marks to differentiate speech from the rest of the text, and sometimes punctuation is omitted. How does this style reflect the atmosphere and themes of the book?

The answer is: to make it feel real to the reader and to give little differences in meaning to readers.

Explanation:

This features are very possible in many books, punctuation in poetry is common to be omitted however the meaning from a book is quite different. Authors often ommit quotation marks so as to allow the reader to feel the text as "real", by the author pretending is real himself. On the other hand, when punctuation is ommited it may be for different circumstances, for instance, if commas are omitted in a line it may mean "rush or anxious" also, authors omit punctuation to allow sentences to run to each other giving the reader the freedom of ambiguity or differences in hints of meaning.