Why did Mark Twain begin his story with a warning and explanation in the beginning?

Twain greets readers with a "NOTICE" before he steps aside and allows Huck Finn to narrate the story. The following narrative, Twain warns, should not be analyzed for "motive" or "moral" or "plot" or punishment will follow. In the Explanatory, Twain notifies readers that characters will sound as if they live in the region in which the story takes place.

Explanation:

These statements serve three purposes. First, the warning is a satiric jab at the sentimental literary style, which was in direct contrast to Twain's brand of literary realism. Second, the warning introduces the use of satire, a harsh and biting brand of humor that readers will continue to see in the novel. Finally, the warning is a convenient method by which to ward off literary critics who might be eager to dissect Twain's work. Twain recognizes, no doubt, that his novel will incite controversy.

both the address and the poster use diction to convey their message. diction is defined as a style of writing or speaking based on the types of words chosen in order to send a message. parallelism is when a similar sentence structure is used for several sentences on a text; roosevelt's address doesn't follow that. repetition has to do with repeating a word or sentence in order to emphasize and idea, however neither the poster nor the address use repetion. finally, the address doesn't use images to convey a message.

gregor could have been bullying her