The original Chinese title is an allusion to the Beatles' 1965 classic song "Yesterday". References to The Beatles, of whom Jia was an avid fan, are also made throughout the film. Besides dressing up like John Lennon, Jia also fantasized himself as Lennon's son and recited the Chinese translation of the lyrics to "Let It Be" religiously. However, Michael Jackson, who owned the rights to most Beatles songs, declined to give permission for the song or its title to be used in the film. Instead, the film uses songs by Chinese rockers such as Cui Jian, Tang Dynasty and Dou Wei.