- Hostility on the Set: In May 2016, John Carney told the Independent, that while he considered Mark Ruffalo a great actor, and Adam Levine a joy, with whom to work, he didn't like Keira Knightley's performance in this film under his direction. Carney said "It's not like I hate the Hollywood thing, but I like to work with curious, proper film actors, as opposed to movie stars", and "I learned that I'll never make a film with supermodels again." He later apologized and recanted his statement.
- What Could Have Been:
- Working Title: The original working title of the film was "Can a Song Save Your Life?".
Trivia / Begin Again