The Hanners clone doesn't have an Australian accent. It sounds Irish, maybe Scottish, but definately not Aussie.
We don't say dearie, yer, ain't, 'till, 'fore or yank.
Americans do have the
oddest ideas of what Australians sound like as a result of being force-fed Crocodile Dundee, Steve Irwin etc. I've read lots of comments to the effect that Jessie Spencer "doesn't have an Australian accent" or "is trying to put on a British accent" in his role as Dr. Chase in House M.D., when he has a perfectly normal "educated" Melbourne accent.
Having said that "dearie" isn't common here in ladies under the age of eighty; "yer" is OK for "you're", but should have been "ya" for "your"; "ain't" is used in Australia, but most commonly by older males. Aussies don't drop the first syllable from "before", but rather drop the "r" sound at the end (our accents are "non-rhotic" generally*). I'd give "yank" for "pull", and "'till" for "until" a pass though; I hear them fairly often, especially the latter. Given Hanner-scar's "rough as guts" attitude however, I'd recommend "reef out" instead of yank for the authentic psycho-Aussie flavour: "Don't worry, I'll wait till yer dead before I reef out ya teeth!"
Excellent comic, by the way, very funny. The can of petrol is a lovely touch. By the way, what is Hanner-scar's cap-badge? Does Hanner-mum have a whole secret army like a Bond villain, complete with black helicopters and a secret base under a volcano?
* Yes, my Mum made me take elocution lessons to improve my English pronunciation.