In episode 3 "The Launch" the song "Quizas, Quizas, Quizas" sung by Celia Cruz plays during the fashion show. "Quizas, Quizas, Quizas" is the Spanish version of "Perhaps, Perhaps, Perhaps" the theme song for the British comedy "Coupling" in which Richard Coyle, Paul Sabine, is a main character.
The Vivien Leigh/Robert Taylor movie poster that Billy photographs as a gift for Nina is for 1940's Waterloo Bridge. Its French title, La Valse dans l'ombre, translates as "the waltz in the shade."