The scene in which Kurt has meat tied to his leg and is chased by Xian Chow's dog was inspired by a real-life event in which a young Jean-Claude Van Damme was ordered by his karate teacher to wear a protective suit and withstand the attempts of a trained dog to pull him to the ground.
When Kurt's brother is being rescued, his hands are tied behind his back and tries to fight off the attackers. Again, although being paralyzed, he manages to step with his left leg twice while sitting in the chair before the scene is over.
What are the differences between the R-Rated Version and the German Version?
The German Version of Kickboxer is slightly longer because it's based on an earlier cut of the movie before it was released in the States. On the other hand the German Version has been censored for rating reasons and therefore some fight scenes have been shortened. A detailed comparison between both versions with pictures can be found here.