Bill Nighy and Brooke Shields wore their own items on set in order to reduce the film's budget, including the latter's engagement ring.
The quote attributed to Kim's mother "You've got brains in your head. You've got feet in your shoes." is from Dr. Seuss' "Oh, the Places You'll Go".
Felicity Jones plays a 19 year old character in the film. She was actually 26 at the time of filming.