At the beginning Morgan introduces a Ukrainian immigrant to Audrey. Mila Kunis, who plays Audrey, was born in Ukraine, but left the country with her family when she was 7. While filming in Budapest, she and her husband, Ashton Kutcher, took a trip to Chernivtsi, Kunis's hometown. It was the first time she had been back to the country of her birth.
Almost every European place (Lithuania, Prague, Berlin, Paris, Vienna, airport terminals, etc.) was actually shot in Budapest, Hungary.
The director and co-writer of the movie, Susanna Fogel, wanted the movie to show how strong female friendships can be without having "some manufactured conflict." Audrey and Morgan's friendship remains strong throughout the film.
The director and co-writer of the movie, Susanna Fogel, said that she wrote the movie with David Iserson because they were "looking for a hole in the marketplace - a good friendship movie with lots of action."