Buzz's heartfelt speech/apology to Kevin. He's actually kind of a nice kid, when not acting like a total dick.
The first and second time we hear "Christmas Star". The first showing Kevin missing his family once again while looking at a view of New York at night. What adds to the heartwarming is that he says goodnight to his mother, while at the same time in the Florida Resort Kate is saying goodnight to Kevin. The second time was before he decides to deal with Harry and Marv. He makes a stop at the Beth Israel Hospital Children's wing. Where a sick kid is looking out the window and waving at Kevin, who waves back.