In the scene where Dominic Hewson enters the Thai club the song playing is "One Night in Bangkok" as performed by Murray Head who plays the part of Hewson.
The building used by the drug runners to surgically remove drugs from the mule - 19 Tabard Street, Borough, London - has featured in The Knock before. In Season 2 the building doubled as a kebab shop being used as a cover for.... selling drugs.