The Region 4 release looks like it is taken from one of the Anchor Bay releases. The US Region 1 release included longer biographies and filmographies, plus a single page insert with production notes in addition to the extras found on the Region 4.
Anchor Bay's UK release has some film notes in addition to the extras found on the Region 4.
I suspect that the Region 4 is a direct copy of the Region 2. Reviews tend to indicate that the video quality on the Region 1 is slightly better than the Region 2, so on that basis the Region 1 is probably to be preferred if you want the best possible quality. That said, there is nothing seriously wrong with the Region 4.