What is the significance of the film Breakfast at Tiffany's for Yale?

Yale recalls that when he was seven, his father had taken him to see Breakfast at Tiffany's at the movie theater. Because the young Yale had known that his mother was an actor and that actors disguised themselves for roles, Yale had "become convinced that his mother was the one playing Holly Golightly" (73). He had imagined that the way Audrey Hepburn sings in the film might be how "his mother might sing to him if she were still around" (73). The film, then, becomes a symbol for Yale's grief over his mother's absence.