Do not waste your time on this. At least the first 20th anniversary special had a small amount of new material. This has none.
So how do they fill in an hour? Mainly with a bunch of C-list celebrities telling us how great Kath and Kim was, plus a few bloopers.
OK, they do get former prime minister Julia Gillard, which is a nice coup, and I'll give it 1 star for her, and another star because some of the bloopers are moderately amusing (though I have heard they are also on the DVD set). But the rest of it is just bland and boring. The original series was wonderful; this is just a money grab
Don't look at this. It's not unusual and it's not different.