Revealing mistake: In the scene Josh Hartnet's character dumps the vampire into the grinder, and gets beat up by the one who turned into a vampire, in the close-up shot of his face where he is bleeding, look at his nose. The patch make up used for supposed ripped flesh is visible. It's colored orange and is rather obvious.
Suggested correction: I am watching this movie as I write this response. I cannot find this mistake anywhere in this scene. Perhaps if you could be more specific with the time and actor you are referring to as neither Josh Hartnet nor Billy Kitka have anything like what you describe on their face.