Inspired by the book "There You'll Find Me" by Jenny B. Jones.
Rose Reid on whether she could play the violin: "I would definitely not call myself proficient, at least not to the extent that Finley is by far. I played 'Twinkle, Twinkle Little Star', and that was it," she says with a laugh. "But we spent three months, countless hours every other day with a violin coach and kind of worked our way up to being able to play the songs that you see me playing on screen."
The character of Emma (Saoirse-Monica Jackson) was named Erin in the original source-material book by Jenny B. Jones. If the writers had kept that name, it would have been the same name as Saoirse-Monica Jackson's character in "Derry Girls."