In the film, Ritchie is reading a story to Ivy. This is a line from another screenplay that Kara Rainer is writing.
When the old music box was purchased on ebay to be used for the film, it arrived with one black cat whisker inside. Then an additional white cat whisker was added when found on set one day.
In one of the kitchen scenes in Rorrim, the number 13 can be seen on a calendar in the home. Unlucky?