How does O'Neill use foreshadowing in the play, Long Day’s Journey into Night?

Long Day's Journey into Night begins cheerfully enough.... the day is bright, and the initial exchanges between Tyrone and Mary are affectionate and playful, but foreboding clues to the play's tragic turn are quickly introduced. Mary's behavior hints at her return to morphine use. We learn that she had spent a sleepless night and that her appetite is poor. She is obviously restless. She also seems slightly disoriented, even mildly hysterical. Her fluttering hands and obsessive concern with her hair, her inability to find her glasses all these foreshadow her mounting loss of self-control.