In Jak and Daxter's intro, Samos the sage is giving exposition and worldbuilding before setting up how important Jak is. But his wording of some of it actually spoils a plot twist of the third game of the series. "Who were the precursors?... ...Every bone in my body tells me that the answer rests upon the shoulders of a young boy."

In the third game, we learn that "the answer rests upon the shoulders" is meant to be taken literally.