During a Q&A at Sundance Film Festival, John Carney said that this film was a dedication to mothers, similar to how Sing Street (2016) was "for brothers everywhere"
Flora, in real life, is the daughter of BONO from U2.
Many of the locations are from around the North inner city of Dublin.
Reunites director John Carney with actors Jack Reynor, Don Wycherley, Kelly Thornton, Keith McErlean and Marcella Plunkett from his previous film Sing Street (2016). Plunkett was also in Carney's earlier musical film, Once (2007).
Peter McDonald (Moone Boy) makes an uncredited appearance as a YouTube guitar instructor.