* ExecutiveMeddling: The film originally ran for about 130 minutes, but Paramount forced director Paul W. S. Anderson to cut around 30 minutes of it (reportedly, mostly gore) after negative reactions at test screenings. Unfortunately, most of the deleted footage was lost or destroyed after post-production.
** Apparently, according to an interview from Anderson, the lost footage was finally found more or less intact.
*** In addition to that, complete copies have been found in 2012 in an [[NoodleIncident abandonned Transsylvanian salt mine]]. [[WhatCouldHaveBeen Too bad the quality of the material is so bad it prevents it from ever getting a proper, cleaned-up BluRay]]
*** [[ItMakesSenseInContext It might help to note]] that salt mines are sometimes used for archival storage, due to the very dry air they contain (the salt absorbs any moisture). Still, [[{{Dracula}} Transsylvania?]]
* HeyItsThatGuy:
** Dr. Weir might be descended from [[Film/JurassicPark Alan Grant]].
** DJ is a pre-''Film/HarryPotter'' [[JasonIsaacs Lucius Malfoy]].
** Cooper is [[TheSarahConnorChronicles Agent Ellison]]. No, really.
** Miller is [[Film/TheMatrix quite acquainted]] with evil machines.

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