When Arturo tells Liz he needs her to close up the diner because Carl's wife is in labor, she asks "Again?" Carl's wife being in labor is the reason Arturo was working extra when Liz first came home in the pilot.
The amount of copper wire Michael claims to have stolen over the last thirteen years amounts to somewhere between 1,000 and 1,500 pounds, if he accounted for the changing price over the years.