Heavily inspired by the films "Up" (2009, Pete Doctor) and "(500) Days of Summer" (2009, Marc Webb).
The main score (titled 'Philip & Justine's Theme') composed by Tristan Tyrcha was inspired by Michael Giacchino's music for "Up" (2009, Pete Doctor) and various scores of Clint Eastwood's.
In the original screenplay, Philip (Kyle Dal Santo) and Justine (Brittney Refakes) went ice skating. Director Hannah Stevenson had it changed to roller-blading.