In this Mathnet installment, George Frankly hints to the Problem of the Passing Parade. He talks of two kidnappers from The University of Michigan. Actually, John Phillips Lousa flunked out of Michigan his freshman year. He graduated from Michigan State. (Where Floyd Tyrone attended college is anyone's guess.)
Back when the Mathnet segment in this episode was filmed, all Area Codes had either a 0 or 1 in the middle. That was changed in 1995 and as a result, 253 is now an Area Code in the Seattle-Tacoma area.