The Beatles‘ A Hard Day’s Night is one of the most famous rock ‘n’ roll movies ever. John Lennon wrote a song for A Hard Day’s Night that the film’s director didn’t like. Subsequently, the track became a hit.Walter Shenson produced A Hard Day’s Night while Richard Lester directed the movie. During a 2000 interview with Salon, Shenson discussed the film. “Dick and I came up with the idea of [writer Alun] Owen to do the screenplay — not because he was available and had done a play and some television but because he was from Liverpool and it seemed natural that he could write in The Beatles’ idiom,” he said.
Source: cheatsheet.com