A copy of the James Bond novel "From Russia with Love" is clearly shown as part of Drake's library. The edition used is the movie tie-in paperback featuring a photo of Sean Connery on the cover. Bond regular Desmond Llewelyn also appears in this episode.
When Drake pulls the agent from the Ethereal Insurance Company into his flat, the (only) number on Drake's door - is number '6'.
Drake's address is given as Chelsea Mews, South [London].
Drake uses a Polish WZ. 35 VIS pistol (aka RADOM) to dispatch the villains into the ether.
When Drake does the 'mirroring' with Lovegrove, the 2 actors were working face-to-face - on almost perfectly mirror sets, but when 'briefcase and umbrella' come in, and Drake turns to them, if you look, the mirrored set is accurate except for the Chinese vase; both the one behind Drake and the one in the mirror are the same.