Jem helps Dill to get cleaned up and takes him back to the Finch house, where they listen to Dill's story about how he ran away from home.
Dill and Jem see the shadow of Atticus Finch when Jem is on the porch of the house.
Jem and Dill are sitting up high in the balcony during the courthouse meeting, as they are not allowed to sit on the main floor with the rest of the adults. They are watching the trial from a distance to better understand what is happening.
Jem goes to the Radley's house and slaps the side of it because Dill dared him to.
Jem's response "In a pig's ear you did" is slang that means disbelief or skepticism, similar to saying "I don't believe you" in a playful or sarcastic way. Jem doesn't think that Dill actually helped engineer the train; he is expressing doubt about Dill's claim.
Dill loses his pants on the fence of Boo Radley's house after Jem and Dill go to the Radley's house to deliver a note to Boo. Jem was stuck on the fence and Dill got him off, but then Dill lost his pants in the process.
Jem touches the house, because Dill dares him to. And Jem doesn't want to be a coward, so he does it to prove to Dill that he is not afraid.because he was dares by Dill to touch it. Since Jem always takes dares, he did it.
Jem's betrayal of Dill showed his loyalty to his family and his belief in following his father's rules. It also demonstrated his struggle with conflicting feelings of duty and empathy toward his friend.
Dill had seen Dracula, a scary movie.
Jem tries to teach Dill about courage, empathy, and the importance of standing up for justice and equality, as demonstrated through his father Atticus's example during the trial of Tom Robinson. Jem encourages Dill to understand the complexities of the world around them and to develop a sense of moral responsibility.
Dill tells Scout and Jem that he didn't have any pants on after he escaped from his home and traveled to Maycomb because he wanted to swim.
In their second summer, Dill is more mature and shows an interest in civil rights issues, while Jem is growing into adolescence and becoming more serious and responsible. Dill's curiosity and activism contrast with Jem's changing outlook on the world around him.