As an Australian, I might be able to shed some light on why Kevin Smith's jokes were killing in that Netflix thing, which I also watched the start of recently in a dark moment of da Vinci Code-style self punishment.
To an outsider, it might have seemed like Smith was making incredibly broad, uninsightful observations about Australia to Australians who are already aware of all these things, and indeed he was. So what was the appeal to this audience of Australians?
An aspect of the Australian national psyche is what is known as the Cultural Cringe. There is a great deal of writing out in the ether about this element of Post-Colonial Theory, but essentially it boils down to a national obsession with what foreigners think of Australia and its people.
Also, every single person in that theatre was incredibly high.