Kept the title spoiler-free, but in case anyone's not that far yet and is still here reading, it's about books and letters in act 2 Moonrise Towers, First Floor that are spoilers for the upcoming cinematics and the start of act 3 as well in fact.
I'm talking about the book "
Elder Brain Domination". It's a short read, but it basically talks about a lot of plot points that get revealed right before the boss fight in act 2 and some that become clear early in act 3. Almost every single sentence in that book is supposed to be a big reveal in upcoming cinematics, but it's just lying there under loose planks and no one in the party responds to reading it in any way whatsoever. At the start of act 3 Gale is exhilarated about the big reveal on Netherese magic and the Crown of Karsus, even though he already knew because he read the book in Ketheric's bedroom earlier. Jaheira specifically asks for intel on anything Ketheric and Absolute related, because aside from undoing Ketheric's immortality, gathering intel is the main mission for her. And yet, we can't use the book to talk about it with her or even straight up give it to her. So they're not only spoilers for the upcoming cinematics for the player, but there's also no reactivity in the world when it comes to this mother lode of information, possibly the single most plot revealing book of the game.
Next to that, the same room also has the letter "
Missive from Gortash". Another short read, outlining that Gortash knows about the Gith Artefact and is in a position where he's working together with Ketheric and even ordering him to do things. At this point you can easily not have talked to Florrick at Last Light Inn and she'll still go through with going ahead to Baldur's Gate and will try to work with Gortash to stop Ketheric. So not only is the big reveal that Gortash is working with Ketheric spoiled by this letter, you also have zero agency after reading it to stop Florrick from walking into a trap in your conversation with her.
Obviously you can't add new dialogue lines or more world reactivity at this point, so by far the easiest option would be to just move the book and the missive from Ketheric's bedroom to the boss room in the Mind Flayer Colony, either on his body or on the table with the other books that are there. That way you can't get spoiled much, the book will be a nice recap for people overwhelmed by the cutscene reveals, and it would make sense that you couldn't warn Florrick as you learned the information about Gortash too late.
