Leading ladies Olga Kurylenko (Kara) and Oona Chaplin (Maddy) both appeared in the James Bond movie 007 Quantum (2008), Oona's mother Geraldine Chaplin having played a bit part in the earlier Casino Royale (1967).
Ciaran Hinds & Oona Chaplin both started on Game of Thrones as Mance Rayder & Talisa Maegar/Stark, respectively.