These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: A Feast for Crows
Genius Bonus: Lady Genna tells Jaime that Lord Tywinn referred to his successor as Hand of the King as "The Chuckler" because the only thing he was good for was chuckling at King Aerys' witticisms. A similar derogatory nickname was given to Wilhelm Keitel, the formal leader of the German Army in World War II, as his main qualification for the job was his abillity to chuckle at the wit of another insane dictator.
They Plotted a Perfectly Good Waste: Its real purpose was to demonstrate that the intricate plots of her father Doran are also quite fragile. Also, it demonstrates that Arianne isn't as smart as she thinks she is.
As well as giving her some hopes for Character Development, as she quite clearly understands the concequences of her rashness and may learn from it.
Trapped by Mountain Lions: Brienne's storyline battling against the Brave Companions provides some awesome moments for her and Pod, but ultimately it doesn't add to the plot that much, at least until Lady Stoneheart and the Brotherhood show up.