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?
Probably the fact that Paltrow isn’t really all that great if an actress and shouldn’t be in period pieces. Combined with Hollywood’s apparent inability to really do much with that genre without altering it for mass consumption. It messes with the story too much.