When Olivia and Simon are talking about their childhoods, Simon asked if she preferred The Dukes of Hazzard (1979) or Little House on the Prairie (1974); she responds "Dukes". Michael Weston, who plays Simon, was in the 2005 movie, The Dukes of Hazzard (2005).
It is revealed that Benson's father died ten years earlier.
Olivia mentions her mother, Serena Benson, died. She had found out about her mother's death in the episode Taken (2000).
The title of the episode, Philadelphia, may have more to with the city's nickname rather than the city itself. Philadelphia is nicknamed "The City of Brotherly Love" and in this episode, Benson meets her long lost half-brother.