- In the original release of the movie, Jázmin Dammak played the part of Sonja, Viktor's daughter, in the flashback scenes, however after the release of Underworld: Rise of the Lycans (2009), a version is available (most notably on U.S. Netflix) where scenes with Rhona Mitra were inserted in place of the original scenes.
- From Underworld's FAQ: The movie was released on DVD in two different versions, the R-rated theatrical version (for strong violence/gore and some language) as well as the unrated, Special Edition extended cut. However, the extended cut mainly adds some story line, thus inflating the movie to more than two hours.
- The "Unrated Extended Cut" contains 12 minutes of additional footage and 11 minutes of replacement footage.
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