The irony of Frankie and Craig using fake accents during the party scene is that both Dichen Lachman and Ben Robson in real life both are using their real accents as she is Australian and he is British.
Dichen Lachman's character, Frankie said she is not Australian. But Dichen's, on the other hand, biological father is Australian and she is an Australian citizen herself.
Frankie makes mention of a Rembrandt painting her father stole from Boston in 1990. The Rembrandt painting in question is called "The Storm on the Sea of Galilee", which was taken during the heist of the Isabelle Stuart Gardner Museum.