During the intoductory scene to the movie (before the intro credits roll) after the killer Michael is hit over the head with a large lamp by his sister Laurie in her room watch his hair styles as he chases her through the corridoor, within the corridor and stairwell his hair is dark brown and spikey/messy, when he gets up the stairs and on to the rooftop of the building where the chase is set his hair is now a blond-fair colour and slicked back against his head and then the next scene...that's right you guessed it, its dark and spikey, this also happened during the schoolhouse scene in Halloween 4, but that's a different story...