 In the DVD Commentary, Rob Zombie (qv) revealed that  Jake McKinnon (qv) (The Professor) couldnt see very well in his  costume. In the scene where he swings a real axe at Denise his  vision was so bad he could have seriously injured  Erin Daniels (qv) if she didnt move fast enough. Rob says in his  commentary, "We just assumed she would get out of the way."