In To Kill a Mockingbird, how does the Boo Radley game change and what does Scout hear when she rolls into the Radley yard?

In Chapter 4, Scout describes their "melancholy drama" which is titled Chapter XXV, Book II of One Man's Family. She says that Jem played the main role of Boo Radley, and they constantly polished and added dialogue throughout the plot each day. Scout describes "Boo's big scene" where Jem would fake stabbing Dill with scissors to imitate the rumor that Boo stabbed his father. The children attempt to keep their game a secret and pause anytime a neighbor passes or looks at them. One day, Atticus sees the children playing the game and asks if it has anything to do with the Radleys. Jem denies any association and Scout mentions that she wants to the quit the game. The children continue to play the game because Atticus never technically said they couldn't, but decide to change the names of the characters to avoid accusation. The second reason Scout mentions that she wants to quit the game is because she heard someone laughing inside the house when she crashed into it.