In the flashback, Kate apologizes to the Australian rancher and pronounces "sorry" with a Canadian accent (rhyming with "gory"). Kate later lies to the rancher and claims to be Canadian, which is actually true for actress Evangeline Lilly.
The title is Latin for "clean slate," in reference to the metaphorical new life that Jack and others say the survivors receive on the island.
The flashbacks in this episode are the first to reveal Kate's criminal past.