Basically it was all about moving to base 10 Currency system (Metric) from Pounds Shillings a Pence.

Change over 4 February 1966.

Suggested Alternates to the Dollar; I think, an opportunity missed.

Austral, the OZ, the Boomer, the Roo, the Kanga, the Emu, the Koala, the Digger, the Zac, the Kwid, the Dinkum, and the Ming.

All Australian notes are plastic - fun fact Australian Mint (Not really) makes money licencing the tech to make plastic money to other currency jurisdictions.

https://en.wikipedia.org/wiki/Australian_dollar

At least after 1788

The Meter, Kilogram, and Litre

'cause

IMHO one of the best things.