US version was heavily cut for violence to be in accordance with MPAA demands for a "R" rating.
Region 1 DVD is the U.S Cut version. Not the uncut international version.
The UK Region 2 DVD from Film Four is the full cut of the film. It includes the extra POV chopstick death scene, a full pan across on the severed head in the stairwell, as well as many other small cuts made in the U.S. to attain an "R" rating.