After the initial questioning of Sylvie (guest star Caroline Proust), Weller mentions that he liked the Good Cop, Bad Cop bit they had just done. Captain Marleau asked him if he thought this was "Spiral". Spiral, the English name for the French detective series "Engrenages", starred Caroline Proust, and Corinne Masiero, a.k.a. Captain Marleau, appeared in five episodes of season three of "Engrenages".