==Samples==
* "[[Mr. Self Destruct]]" begins with a sample from the 1971 film ''THX 1138.''. It is taken from a scene in which a man is being beaten by a guard depicted on a holographic television. [http://www.discogs.com/release/4404]* The frantic drumming at the end of "[[Piggy]]" played by [[TrentReznor]] himself - his himself—his first and only attempt at live drumming on a record, and one of the few "live" drum performances on the album ([[Stephen Perkins]] on "[[I Do Not Want This]],", [[Andy Kubiszewski]] on "[[The Downward Spiral (song)|The Downward Spiral]]," and [[Chris Vrenna]] on "[[Hurt]]"). He states that it was from him testing the mic setup in studio, but he liked the sound too much to not include it. [http://www.9inchnails.com/articles/articles.php?id=6]
* "[[Closer]]" uses a heavily modified sample of a kick drum from the song "Nightclubbing" from ''The Idiot'' album by Iggy Pop. [http://www.9inchnails.com/articles/articles.php?id=6]
* "[[A Warm Place]]" is based on the melody from [[David Bowie]]'s 1980 single "Crystal Japan". Some hear it as a complete rip-off, while others argue that from a music theory point of view that the structure has significant differences.
*The looping female voice that appears on "[[Reptile]]" (approx. 5:06) is from the 1974 film ''The Texas Chain Saw Massacre.''.The strange Mechanical mechanical sound before the drum drums start can be find found in the movie "''Leviathan" '' and the other sounds during all the song is are found in ALIENS ''Aliens'' (the escape in the vessel).
==Live==