How does the author use foreshadowing in Fool for Love?

Shepard's technique of using the old man as the ghost of their father is quite effective. He watches the action and comments on his side of the story. He is particularly connected to Eddie, who even looks at him at certain points during the play. It's as if in seeing his father, Eddie is looking at himself regarding the issues of alcohol and infidelity. In the end, the old man releases himself from any culpability for Eddie's mother's suicide, even though his actions had clearly driven her to that act. The father's weakness has foreshadowed the son's; Eddie is repeating the same transient lifestyle that the old man had pursued, alternately running to and away from love that is offered by many women.