Who is the main character?

Who changes, learns something or gets a different perspective on life?

Which still shots best illustrates Alice's changed attitude:

This dialogue in the final scene is foreshadowed by...

... before he eats him." says Billy about President Pierce.

This foreshadows this section of the final scene:

Which character is very reassured, certain of everything?

What certainty is about to be crushed for the viewer in the final scene of the movie?