When the police are looking through a victim's room, there is a framed poster of Louise Brooks on the wall.
Kate Maberly, who plays Holly Reid, is the younger sister of Polly Maberly, who played Julie Stockard in Season 4, Who Killed Cock Robin? (2001).
Marian McLoughlin plays Barbara Judd in this episode. She returns in episode 10.7, They Seek Him Here (2007), in the role of Gwen Morrison.
Nicky Henson plays Simon Reason in this episode. He returns in episode 10.7 in the role of Terence Charteris.
The song 'Tangerine' is sung by Bob Eberly, with Jimmy Dorsey's orchestra. [Closed caption says it is Frank Sinatra, but it's clearly not.]