I think mine’s Z for Zachariah. The book is insane. A psychological survivalist thriller between a 14 year old girl and a strange man with unknown intent. The movie is… not this. They changed everything meaningful about the characters and lost all the tension. Hope someone does it properly one day. What’s your adaptation peeve?
Planet of the Apes. In the novel, the planet is NOT Earth!!!
And yet they have the same animal species and speak English!
The book is painful.