Although briefly visible on screen, the 'dead' Cosette was a soft model/puppet built exclusively to match the actual dog. On the day of filming, when the director was dissatisfied with the model's rubber tongue, a realistically limp tongue was fabricated by the prop department using a thick slice of prosciutto.
The jacket that Eddie is wearing when he takes Christopher home is the same one Richie Aprile gave to Tony (who later gave it to his housekeeper's husband) in Full Leather Jacket (2000).
The figurine Furio brings from Italy for AJ is seen in season 6 episode 14. The creepy figurine is shown at the end of the movie that plays in the episode.
The name of the rehab center Christopher is called "Eleuthera House." "Eleuthera" is the Greek word for "freely" or "freedom."
The Yankees-Red Sox game that Paulie puts on the TV is from September 4, 2002.