Marisa Abela had done most of the singing in this film herself. She trained extensively to mimic Amy Winehouse's vocals.
Reg Traviss and his relation with Amy Winehouse is completely omitted. Amy dated Reg for the last two years of her life and they were together at the time of her tragic death yet he is never mentioned in the film. Also omitted is Amy's relationship with Pete Doherty (The Libertines's former singer), a friend with whom she had a short affair while Amy and Blake Fielder-Civil were split-up. He is mentioned once throughout the movie.
Scenes were filmed at Ronnie Scott's Jazz Club at 47 Frith Street, Soho, London W1D 4HT, England and outside Winehouse's first flat in Camden Town, and at Primrose Hill, London. In February, scenes were filmed inside the Metropolis Studios in Chiswick, London.
Jeff Tunke claimed he was cast as Mark Ronson and his scenes were deleted. However, director Sam Taylor-Johnson said Ronson was never a character in the film.
Following the death of Winehouse on July 23, 2011, several filmmakers attempted to create biopic projects but none of them progressed. By 2022, StudioCanal UK moved forward with production, and filming took place in London from January to April 2023.