Nightmare Retardant: Giant albino penguins. They are described as six feet tall and eyeless, shambling about and squawking loudly, a far cry from this◊. A bit unsettling depending on the reader.
Slow Paced Beginning: Fifty pages of description of how their scientific expedition was meant to go. How it actually went starts around page sixty.
Values Dissonance: The reader is meant to sympathize with the "upper-class" Elder Things over the "lower-class" Shoggoths, which were manufactured en masse by the Elder Things to act as their servitors. Admittedly, it's easy to do when one is rational and ill-fated and the other is a formless, possibly non-sentient mass of black goo trying to rip your head off (literally), but still. It's like a biological ancestor to the Robot War.