The opening nightclub sequence uses Ron Grainer's disco cover of his theme tune for the series, released in 1979 on RK Records (catalogue number RK Records: RK 1018).
The second of two appearances by Joseph Cotten, the first being in S1 E7, Edward the Conqueror (1979).
The first of two appearances by Gloria Grahame, when she was already terminally ill. The other was in S7 E9, Sauce for the Goose (1984), which aired a considerable period of time after her death.
Roald Dahl's original short story is actually called "Nunc Dimittis".