The film's soundtrack of songs by The Beatles are not actually performed by them but by other artists except for a contribution on the Elton John cover of 'Lucy in the Sky with Diamonds' by 'John Lennon' billed under the pseudonym of Dr. Winston O'Boogie on backing vocals & lead guitar. The number of Beatles songs used in this film totals to 28 tracks on the soundtrack. Movie posters ran with the byline, "Words and Music by John Lennon and Paul McCartney".