Writer/director Celine Song's name is listed as the playwright for John's play on a poster outside the theater, because the play is actually a real one she wrote back in 2016.
First thoughts for the film began around 10 years ago, when writer/director Celine Song worked for a professional matchmaking service for about six months.
Chris Evans admitted that John's ratty apartment and obnoxious roommates brought back many memories from his own time as a struggling actor.
While Lucy and Harry's apartments were filmed on-location, John's apartment was built in-studio. Director Celine Song shared photographs of a place where her husband, Justin Kuritzkes, formerly lived, as a reference point for the dilapidated apartment.
John Magaro, who voices the character Mark P. (never seen on screen), played a key character, Arthur, husband of Nora, in Past Lives (2023), also written and directed by Celine Song