There are a number of changes in the German version:
- All blood and gore effects were removed
- Corpses disappear a few seconds faster
- All weapons which allow to set enemies on fire were replaced with other weapons
- A few cheats relating to blood and gore effects were removed
A detailed list of changes can be found on schnittberichte.com
In the sewer levels there are signs that read...
Why are you people so stupid? We have to put signs all over the place because if we don't you would walk off a cliff into a lava pit or something. What is up with that? Come to think of it, you won't read this sign anyway. So what's the point.
In the Citadel lever there are funny little subtitles beneath the signs on all the military buildings. I won't spoil the surprise so you will have to look for yourselves. Easy to find though.