The "dollar bill" Ned picks up is clearly a hundred-dollar bill.
Willie previously mentioned in I Love Lisa (1993) that his father was hanged for stealing a pig. Yet, the father appears when the group goes to Scotland.
Mr. Burns and Homer mispronounce "slovenly."
Willie's parents are introduced in this episode, but in Who Shot Mr. Burns? Part One (1995), Willie mentioned that he's fathers was buried: "Me own father got thrown in the bog".