When Daniel and Juli are traveling through Romania, only photos are shown instead of real film footage. The reason for that is the Romanian government didn't give permission to film in their country, so they had to take photos instead.
The moment when Daniel sees Melek for the first time, the walking scene is shot reverse for Melek and played backwards to make a more charming introduction.
Originally, Daniel and Juli were supposed to sing The Cure's "Friday I'm In Love", but the rights were too expensive. When the music supervisor was able to secure the rights for "Blue Moon" instead, the script was changed at the last minute to include a conversation on oldies.