is what I call it when people start attributing to the book things that were only in the movie. Oz is full of this. Here's an example, a background paragraph from an article about a local theater group that does a stage adaptation of The Princess Bride:
Though "The Princess Bride" began life as William Goldman's 1973 novel about a grandfather telling his sick grandson a story involving, to quote Goldman, "Fencing. Fighting. Torture. Revenge. Giants. Monsters. Chases. Escapes. True love. Miracles," most people know it from Rob Reiner's 1987 movie adaptation.And apparently you're one of them.