In the scene where Amy is working at Mrs. Clennam's house, the embroidery that Amy is working on reads 'Istanbul Yadegari' in old Turkish, literally meaning 'a souvenir from Istanbul'.
Emma Pierson (Fanny Dorrit) & James Fleet (Frederick Dorrit) also worked on episode 2.4, Death in the Clinic (2013), of Death in Paradise (2011) as Anna Jones & Jeremy Tipping respectively.