In multiple scenes during their trip though the outback, a long serpentine tire mark appears on the road indicating that scenes meant to have taken place in different locations were all filmed at that spot.
The boys head north out of Sydney over the Sydney Harbour Bridge to get to Freemantle. A very long way round.
One of the characters says that AC/DC got their name from a vacuum cleaner, when they actually got it from a sewing machine.