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.
Nightmare Fuel: Giant squid in general, which is the basis of the book. In addition to their alien appearance, the one in the book is damn near unkillable, is extremely aggressive, is afraid of nothing, can sink a small boat, and is over a hundred feet long. And oh yeah, there are more of them being born every year, because we killed off most of the animals that keep their numbers down...
Tear Jerker: It's hard not to get a tear when Whip's first mate Mike, an all-around agreeable sort, is abruptly devoured by the squid after spending half the book scared shitless of it.