* "[[The Life You Didn't Lead]]"
On May 5, 2005, in the [http://www.nin.wiki/File:2005_05_05Questions8.gif Access] section of nin.com, Reznor simply replied with "?" in response to the following fan question: "In the .pdf file for the lyrics to the ''With Teeth'' album, there are [sic] appears to be songs listed with lyrics that do not appear on the Dual Disc CD/DVD album. Those songs include "Home," "Message To No One" and "The Life You Didn't Lead". Will these songs be released ever?"
*A song with the title "[[The Warning (Year Zero song)|The Warning]]" is on ''[[Year Zero]]''. When the 2019 Definitive Edition vinyl of ''With Teeth'' was released, the poster was re-created as part of the packaging. Lyrics to "The Warning" were made legible and it was finally revealed that
while the two songs are not the same, the track from ''Year Zero'' has its origins in the track from the ''With Teeth'' sessions.
*The non-album tracks from this era are "[[Non-Entity]]" and "[[Not So Pretty Now]]." They were eventually released on the ''[[NINJA 2009 Summer Tour EP]]''.