The first cut of the film, which was released in Spain, contains hardly any gore and was more of a straight-up thriller. Most of the gore scenes were re-shot and added for the US and UK releases. Scenes that only appear in the original (Spain) version:
- After Jennifer escapes it shows a shotgun on the floor along with a blasted door
- Also after she escapes there's a scene that shows people wondering how she got out
- There's more investigating and police work with the two male cops and there's a also a female cop who doesn't appear in the other version
- Ben has an extra scene at a restaurant and more overall screen time Scenes that were added to the second (US/UK) version:
- The acid shower scene
- The flashback scenes with Gary and Ben as kids
- The blender scene
- The tooth-pulling scene
- Jennifer being abducted at the nightclub
- All of the dog scenes
- The scene where Jennifer is on her cell phone
- Jennifer and Gary fighting over the gun
- Jennifer shoots Gary an extra time (in his crotch)
- The videotape of the woman in the acid trap
- The scenes that show some of the aftermaths of the other victims