Unfortunately, no. I already checked out all the sources I know, and I haven't found any info or reason why the Region 4 discs have no extras. And I hate this kind of thing, because when I bought the 4th season just a few days ago, I found the 1st season in Region 4 and my anger went just to the roof.
Ok, I can just buy again the 1st season just for the spanish dubbing (made by mexican actors, of course), but this is the kind of things that makes us spend more and more cash.
Why Universal does this? Why can't make simultaneous releases of their series? (specially this one)...
Best Regards
Joe Quarterback