"Spritz Polecat" is a parody of an actual posh car from that age: The Stutz Bearcat. ("Polecat" is a somewhat obsolete term for skunk.) The car used in this show is nowhere near as valuable, but simply a modern GP Madison kit car.
On this occasion, the filmmakers got the flag on the Stuyvesant Tower correct, being the one with forty eight stars, as was the case for the United States from 1912 to 1959, so it is also appropriate to give credit where it is due, not just pointing out errors as at other times.