3 Important Things that Happen in Chapter 15 :D

One of the most important events we see in this chapter occurs when Huck apologizes to Jim for lying to him, "It was fifteen minutes before I could work myself up to go and humble myself to a nigger; but I done it, and I warn't ever sorry for it afterward, neither" (Twain 86). Prior to Huck's apology, Huck had pulled a prank on Jim by blatantly lying to a worried Jim. When Jim realizes Huck's elaborate story is a lie, Huck feels guilty for his actions. This passage first demonstrates a precipitation of Huck's compassion for Jim, as well as a turning point in Huck's struggle between his heart and his social conscience, due to the fact that Huck is willing to apologize to a runaway slave for his misbehavior even though this would be deemed as "socially inappropriate."
Another important detail occurred on page 83 when Jim called Huck "boss." Although we know that Huck is a person of no account, Jim still refers to Huck as his boss. This is important to the story so that audiences are reminded of the social relationship between Huck and Jim: white boy and runaway slave, respectively. Although Twain makes efforts to humanize Jim, audiences must remember that Jim is still a slave and thus still inferior to Huck, however "worthless" he may be. Moreover, by clearly establishing this relationship, we, as the readers, are more aware of the times when Huck is following his heart and/or growing in maturity.
Finally, the third detail take us back to the beginning of the chapter when Jim and Huck have been separated on the river. They send each other "whoops" in hopes of finding the other. However, they fail to find the other until the morning after. But the result is irrelevant when considering the why of the actions and behaviors of Jim and Huck. Throughout the night, Jim and Huck are persistent in their whooping until they can not hear each other any longer. This determination demonstrates and foreshadows signs of a growing relationship between the two characters. Instead of showing repugnance or disgust, they share a compassion and care enough about each other to arduously try to locate the other's whoops.