It also goes to show how Forrest has changed from the young boy we first met to the man we see in the ending. Though variations of this differ between the movie and novel, they both show maturation and stark differences between the two aforementioned points. This allows us to reversely see how the people around Forrest have changed and affected him, opposed to only witnessing their changes through interactions with Forrest. This makes the story seem more whole, in general, and provides closure to a lot of the sub-stories that are present in the story.
The major conflict of the present movie is the stereotypes perception of mentally challenged people as cripples; Forrest Gump is not a smart man and he understands this from the very beginning of his life. However, Gump manages to live a decent life, to achieve success that may be never achieved by normal people and becomes a hero of the United States, then a tremendously rich man and finally a happy father. There is hardly anyone who can boast such achievements within one life, and the only wisdom Forrest follows is very simple: “You have to do the best with what God gave you (Memorable Quotes for Forrest Gump). Thus, the conflict of expectations from a challenged person and the reality of his life is put to the foreground of the movie.