You're Next (2011)

Continuity mistake: When the slasher is breaking down the door, the knife position keeps changing between shots.

Zee: You never want to do anything interesting any more.
Felix: I don't think that's a fair criticism.
Zee: Fuck me next to your dead mom then.

Question: Did they always intend to make Erin an Australian? Or could Sharni Vinson not get rid of her Australian accent?