The film was first written in 2015, and the war was said to have broken out in the "far off" date of 2018. The film ended up not actually made until 2018.
The part of Vinnie was written for Thomas Fitzgerald. However he was cast as Ryan, as Vinnie was thought to be too similar to his character in Aaron. Had he played Vinnie, this would have been the second time he and Kaireht Yovera played an ill-fated couple.
Becky's part was originally much smaller. But Kaireht Yovera proved so nice and accommodating during pre-production that filmmakers were compelled to write more for her. She largely ad-libbed her confessional, and the argument with Vinnie was entirely improvised on her part.
When filming Shane's confessional, Paul Sparkes asked to leave the camera running so he could ad-lib the "Scotty's a good kid" speech.
Robert Madden is 6'3", while Bobby Calloway is 5'7". For the scene where they hug, Bobby had to stand on a stack of books to minimize the height difference.