One of the best moments in the book, hands down, is when Martin throws shade at Game of Thrones and the show runners David Benioff and D. B. Weiss. Under the guise of the discussion of a book called "A Caution for Young Girls", Martin makes his opinion of certain decisions made in the adaptation process of his own books very clear. He begins by calling the book “distasteful,” a book found in brothels and catering to those of low morals. He then mentions that parts of the book “strain credulity” given how ridiculous the tales are, and increasingly so as the story continues.
“We have no way to ascertain the veracity of her story, nor even whether she was in truth the author of this infamous book (some argue plausibly that the text is the product of several hands, for the style of the prose varies greatly from episode to episode).”
(Fire and Blood, p. 157)
I mean…good lord. The use of “episode to episode” makes the true object of his ridicule pretty clear. But he doesn’t stop there. Continuing with his mockery of the writers of the tales, he writes,
“[T]he scribes responsible were most likely septons expelled from the Faith for drunkenness, theft, or fornication, failed students who left the Citadel without a chain, hired quills from the Free Cities, or mummers (the worst of all). Lacking the rigor of maesters, such scribes oft feel free to “improve” on the texts they are copying. (Mummers in particular are prone to this.)
In the case of "A Caution for Young Girls", such “improvements” largely consisted of adding ever more episodes of depravity and changing the existing episodes to make them even more disturbing and lascivious. As alteration followed alteration over the years, it became ever more difficult to ascertain which was the original text, to the extent that even maesters at the Citadel cannot agree as to the title of the book, as has been noted.” (Fire and Blood, p.158-9)
I found it heccing weird because he stops in the middle to write a long description of this ultimately insignificant book.