Trivia

Though being a decent singer, James Corden's singing was done by the real-life Paul Potts.

The scene where Potts sings on Britain's Got Talent (2007) is actual footage of the judges and the audience. With some clever editing, Paul Potts is replaced with James Corden on-stage.

Katy Perry was offered the role of Julie-Ann "Julz" Cooper, but declined.

Taylor Swift wrote and recorded an original song for this movie. It's called "Sweeter Than Fiction".