The first half is basically showing you reality ensures when you have a crazy **** like Rick.
I live across the ditch and this isn't very strange to me, its real with some exaggeration of course with most being negative traits. Australians actually pull this kind of ****, just not all at once which makes it disturbing. Note that Both Rick and Doug are high as on weed.
They have few guns and a handgun is a quite stand out weapon to have as it has no hunting utility, so if you read about an armed robbery in Aus or in NZ it would be a sawn off shotgun ie the Mad Max special. The handgun might as well be a portal gun in context.
Pointless drives out into middle of nowhere, yep. Wheel alignment, yep. KICK THE BALL, 100%. Diesel in the petrol car, semi-regular. The car appears to be a Holden. The females look fairly typical as are the domestics. The "Bush dimension" is a real joke made with the added twist that a road trip to nowhere wouldn't have any bush. Sucking the penis for snake venom is a common joke. How they "Recover" from that awful not-prank is spot on. The Indian petrol station attendant, yep along with the implied racial tension.
Its disturbingly Australian.