* The frantic drumming at the end of "[[Piggy]]" played by [[Trent]] 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''.