There was serious discussion of a revival of Mathnet as its own program on the ABC network. However, CTW refused to franchise the show to ABC and discussions ultimately went nowhere.
George Frankly had a wife Martha whom he mentioned in every single story, but she was never seen. The two characters are believed to be named after George and Martha Washington, the first United States President and First Lady respectively.
All episodes mention either the number 313 or 131.
In addition to his unseen wife Martha, George had a neighbor in Los Angeles named Mr. Beasley, who is never seen in Mathnet shows. However, Mr. Beasley appears in cartoon form in the Square One TV (1987) segments with Dirk Niblick, another mathematical detective. The animated Beasley often talks about his unseen neighbor George Frankly, and is voiced by Bob Arbogast, who makes a guest role in The Case of the Missing Air (1988) as radio host Byle Dupe, of whom Mr. Beasley is said to be a fan.