What was not a clue to the relationship between Bud and Mr.Calloway?

A lack of shared experiences from their childhood was not a clue to the relationship between Bud and Mr. Calloway. While their interactions and conversations reveal hints of a deeper connection, the absence of memories or significant events from their past does not point to their familial ties. Instead, their relationship unfolds through the emotional and situational context as Bud seeks to understand his identity and family history.