My mistake. I thought she was originally played by Meagen Fay.

Slight of hand
Anyone else notice that Liz's mum was played by a different actress?

Murder was not a transportable offense to Australia. Plus, by 1867 transportation of convicts had all but dried up. Still, it would make sense that he was traveling to Australia given the ongoing theme of travel over the Pacific Ocean.

A suggestion ..
Maybe we should stop referring to what "Trey and Matt" should do or "Trey and Matt" writing styles/content. Let's face the fact that South Park IS Trey Parker nowadays, and has been since the first couple of seasons.