Harsher in Hindsight: All the talk about Robert Jordan's father committing suicide and how he thinks he was a coward for it becomes harsher when you remember Hemingway committed suicide himself.
Nightmare Fuel: Chapter 10. The massacre of the town as told by Pillar. Dear god.
Values Dissonance: Not surprising considering when was this book published. Some modern readers don't appreciate Maria treatment as a rape victim, especially with how troublesome the subject has become in recent years.