Continuity mistake: After finding Krebs, Barb handcuffs him, and he always remains cuffed. But after Barb shoots one bodyguard, and he falls out of the window, we see a shot of Krebs looking startled, and his hands are at either side of his legs - he is now uncuffed, although Barb never uncuffed him.
Trivia: In the scene where Kamil the dog attacks the drunken guy at the crotch, no protection was used in order to make the scene as real as possible, but the dog had been specially trained for weeks beforehand to bite the area, but to not clamp down or force itself down. In the first take of the scene, where Barb Wire makes Kamil sit down, the guy used timed it badly, and forgot to bend down as the dog did. As you can imagine, this was painful.