The final reprise of Love Never Dies sung by the Phantom was improvised by Ramin Karimloo in the final performance of the London production of Love Never Dies. Andrew Lloyd Webber loved it so much he incorporated it into the Australian production.
Includes brief reprises of music from the Phantom of the Opera, including the tunes to "Stranger Than You've Dreamt It", "I Remember", "Twisted Every Way", "Little Lotte", "The Phantom of the Opera (Theme)", "Prima Donna", and references "All I Ask of You" when Raoul sings "Just Ask It of Me" when he sings in "Before the Performance". Despite all of these references, the Phantom's signature song, "The Music of the Night" is strangely absent.
Gustave is named after Christine's father, as revealed in the 2004 film, portrayed by Ramin Karimloo. Coincidentally Ramin Karimloo was the original & final Phantom in the London production of Love Never Dies.
The Phantom's alias Mr. Y is a play on the word Mystery, literally spelling Mystery as Mister-y ("Mr. Y").
The melody for "Beneath a Moonless Sky" was first heard in an extended scene for the 2004 film adaptation of The Phantom of the Opera when Christine sneaks out of the Opera Populaire to visit her father's grave.