Shot in 18 days.
When Casey shows Jin her school, Jin comments: "That's brutal". The referenced building (Southside Elementary in Columbus, Indiana) was created by Eliot Noyes in Brutalist style.
Kogonada visited Columbus on holiday. Inspired by the city's architecture, he stated that he "deeply wanted it to be a part of the first film I made". He describes the buildings there as having "an extraordinary premise for drama" and that the architecture of which forms the common ground between Jin and Casey when they are first introduced.
In an interview after a screening of the film, Kogonada stated that one of the major influences for the film was filmmaker Yasujirô Ozu, particularly his film Cuentos de Tokio (1953).