The film itself is divided into "chapters" the start of which are in the form of a fade from black, except for one instance of a fade from white. The chapter stops of the disc are set at these natural deliniations within the movie.
The chapter numbering of the disc seems to be in error as side one shows on my player as chapters 1-6 and side two as chapters 6-10 (rather than 7-11).
Chapter 9 is a Chace surround sound test program (odd as the sleeve states the surround to be Dolby). Chapter 10 is colour bars.