Cass enters her social security number and it begins with a 9. SSNs do not begin with 9, only EINs and TINs.
Dusty's backstory, told to the pastor previously, is that his parents brought him over from Ireland when he was young. In a scene here, his parents make their first appearance. Dusty's Irish accent is much more pronounced, having lived some childhood years in Ireland, than that of his parents, who lived in Ireland into adulthood. In fact, they have no discernible Irish accent, while Dusty's accent fades in and out.