lol that happened to Kung fu hustle as well, the HK release is just a bare bones release with a trailer. The australian release has stacks of extra bonus shit.
They probably just figure that because it is a local film, they just release it on DVD by itself and then when the foreign distributors come to releasing it they actively seek out extras, because it is a foreign film and they feel there should be extras to give people a better insight into the making, etc.
