Andrew Haigh's childhood home served as the filming location for the house in which Adam finds his parents.
[Jamie Bell, recalling a scene in the film that reminded him of his own parenthood as a father of three]:
"When I tell Adam it's time to go now, Andrew reaches out and puts his hand on my mouth to stop me from speaking. My four-year-old does that. She thinks, if you don't speak it, it won't happen. It's a moment that wasn't in the script. That was just Andrew being brilliant. And you immediately go, 'OK, I'm going to hold his hand now, because that hand is precious to me.' It fuels you, and that's what's wonderful about working with great actors."
[Director Andrew Haigh on using the song "The Power of Love" by Frankie Goes To Hollywood]: "The idea that I used to love that song as an 11-year-old queer kid living in suburban England and that I could put it in a film years and years later, now being very open about my sexuality, is something I never thought would actually be a possibility," Haigh says. "And I can make a film with queer content -- again, something I never thought would be a possibility. And I'm in a relationship, which is, again, something I never thought would be a possibility. I was like, Fuck it, that's going at the end of the film. There was no way I was not doing that. I wouldn't even care if nobody liked it."
Loosely adapted from the novel Strangers by Taichi Yamada, a book which also inspired the 1988 film Ijin-tachi to no natsu (1988).