Bob Dylan was such a big fan of the film that he arranged to have the two leads, Glen Hansard and Markéta Irglová, open for him on part of his world tour. Hansard and Irglová also covered Dylan's song "You Ain't Goin' Nowhere" for the film Io non sono qui (2007).
Steven Spielberg was a big fan of the film. He said "A little movie called Once (2006) gave me enough inspiration to last the rest of the year."
The most expensive part of the entire shoot was the hiring of the crane for the final sweeping shot which cost £2,500.
Markéta Irglová had to get permission from her school in the Czech Republic to take time off to make the film.