At the beginning the bad guy is smoking a dark colored cigarette waiting to make his move. When the time comes he drops and steps on the cigarette. As he prepares his self to chase after the good guy the cigarette will reappear and disappear 3 times and he will drop and step on the cigarette one last time before he ever gets around to chasing the good guy.
As the bad guy first accelerates down the dirt covered hill there is the sound of tires squealing on pavement, an impossibility on dirt.
At the beginning when the test motorcyclists are riding three abreast you can see the shadow of the cameramen's heads bobbing up and down as they film.