Throughout the play Death of a Salesman, Willy Loman frequently hallucinates or recalls several key things, blurring the lines between past and present reality. He recalls all of the options listed:
Conversations with his successful brother Ben: Ben appears in Willy's mind as a voice of advice and a symbol of the immense success Willy failed to achieve. Willy idolizes his brother's adventures and wealth, holding vivid, imagined conversations with him.
His younger sons, Biff and Happy, as promising young men: Willy's memories often take him back to Biff's high school years, particularly Biff's glory as a football star. These recollections highlight the great hopes Willy had for his son's future success, contrasting sharply with Biff's present-day failures.
His affair with "The Woman": This secret from the past haunts Willy, especially the moment his son Biff discovered the infidelity in a Boston hotel room. This traumatic event led to a profound rift in their relationship and is a source of immense guilt for Willy.
Because of his deteriorating mental state, Willy's memories and hallucinations blend with present-day reality, disrupting conversations and causing him to act erratically. These visions are his way of reliving moments of hope and success, or confronting unresolved failures, as his current life crumbles around him