TO KILL A MOCKING BIRD QUESTION!!!!!!?

It isn't necessarily foreshadowing, but you will find out at the end of the novel that the reason that Jem's arm is messed up is because he sought to protect Scout when they were younger. Bob Ewell, father of Mayella, attacked the two one night, and Jem saved Scout but broke his arm in the process. Mayella had accused a black man of , and though it was physically impossible for him to have d her, the all-white jury convicted him and he died trying to escape from prison. Though legally Mayella won, most of the town realized she and her family were white trash after the trial. Ewell felt this was the fault of Atticus Finch, Scout and Jem's dad, who defended Tom Robinson (the defendant) in the case, and Ewell drunkenly tried to attack his kids after the trial. Hence Jem's permanent injury. It foreshadows in the sense that that night, and that whole trial, changed Scout and Jem for the rest of their lives in a physical and emotional sense.