The broadcast version of this episode included two musical cues from the score for the film Spy Game (2001) by Harry Gregson-Williams: "Operation Dinner Out" and "Beirut, a War Zone".
Danny says that Christine Dale is Californian. Megan Dodds, who played Christine Dale, is actually from California.
The film being watched in the teaser is The Third Man (1949). Many of the themes of that film are echoed in the episode including the appearance of a previously thought dead character.
At the end of Season 2 Episode 10 just after the gunshot, the music which plays is "Operation Dinner-Out" from the 2001 movie "Spy Game". When the series was released on DVD (at least in the UK), this music track was replaced. On-demand services still have the original version.