In "It's a Miracle," Waters makes a scathing reference to Andrew Lloyd Webber (whom he would accuse elsewhere of having plagiarised music from Pink Floyd's "Echoes" for sections of the musical "The Phantom of the Opera"): The same song features a sample from the 1977 low-budget zombie film "Shock Waves" in which the film's characters wrestle over a flashlight. The title track begins with the lyric, "Doctor, Doctor." "Take Up Thy Stethoscope and Walk" on "The Piper at the Gates of Dawn", the first song written by Waters, opens with the same line.