Doppelgänger is the second full-length album from American rock band The Fall of Troy, which followed up the band's bootlegged Ghostship Demos EP from 2004 as well as their self-titled LP from 2003. Four of the songs ("I Just Got This Symphony Goin'", "F.C.P.R.E.M.I.X.", "Mouths Like Sidewinder Missiles", "Whacko Jacko Steals the Elephant Man's Bones") were re-recorded versions of tracks from the self-titled album, hence the name Doppelgänger. "Macaulay McCulkin" was taken from the Ghostship Demos EP.
The title "Laces Out, Dan!" is taken from a quote in the film Ace Ventura: Pet Detective. In the movie, the person in reference is Miami Dolphins player Dan Marino.
The title of the song "Tom Waits" is in reference to the singer Tom Waits, who also has a song named "The Fall of Troy".
"Whacko Jacko Steals the Elephant Man's Bones" is a reference to the music video of Michael Jackson's "Leave Me Alone" in which Michael Jackson dances alongside a claymation portrayal of Joseph Merrick's, the Elephant Man's bones.