In the opening scene, when Tony's looking at the front-page story in his local Star-Ledger newspaper, it's one written by "Bob Shaw." That's actually the name of The Sopranos (1999) longtime production designer.
The song played throughout the episode is the "Peter Gunn Theme" by Henry Mancini, and "Every Breath You Take" by The Police. It was mashed together by Kathryn Dayak from HBO.
Robert Funaro, who plays Eugene Pontecorvo, is listed as a series regular this season despite not having a major story line until Season 6. This is because he was originally cast to play Ralphie Cifaretto before Joe Pantoliano stepped in to take over.
The episode's title and the plumber's name in the episode, "Mr. Ruggerio," might be a reference to Angelo Ruggerio. Angelo was a member of the Mafia whose home phone was wiretapped by the FBI in 1981.
The mash-up song played throughout this episode mirrors the FBI's investigation and surveillance on Tony Soprano and his family. The song is a combination of the 'Peter Gunn TV Theme' [1958] by Harry Mancini (a TV show about a Private Investigator) and 'Every Breath You Take' [1983] by The Police (rumoured to have been written about Sting's stalker).