* KeepCirculatingTheTapes: The series has not been rerun since the early 2000s, when it was rerun on Creator/{{Noggin}}, and there are currently no DVD releases planned. Domestic recordings do exist of many episodes, and they sometimes show up on Website/YouTube, but they are nowhere near exhaustive, and quality varies widely.
* SameLanguageDub:
** In "The Case of the Willing Parrot" from ''Mathnet'', the voice of Sunshine the Talking Parrot, who played as Little Louie, was provided by Jim Thurman.
** One of the shows' recurring sketches was "Grown-Ups". In the sketch, kids would talk about how they were going to need math in the future, but their voices were provided by adult celebrities, by the likes of Ed Koch, Lawrence Taylor, Marv Albert, Robin Leach, James Earl Jones, and Joan Rivers. This was done intentionally.
** In "The Case of the Calpurnian Kugel Caper" from ''Mathnet'', in some shots, you are looking at Peggy Shay, and hearing her voice. But in other shots, you are looking at her, and hearing her same-language-dubbed-in-post-production voice, which was provided by Jon Devries. Again, this was done intentionally.
* ScrewedByTheNetwork: [[WordOfGod According to Toni DiBuono (Pat Tuesday) and Joe Howard (George Frankly)]], the Children's Television Workshop abruptly canceled the show despite high viewership because they wanted to free up funds for ''Series/{{Ghostwriter}}''.
* TooSoon: An exception - not long after the World Trade Center in the city of New York was attacked in the year 2001, Noggin aired an unedited episode in which George Frankly casually discussed having dinner there at its restaurant (Windows on the World).
* WhatCouldHaveBeen:
** Creator/PhilHartman auditioned for the role of George Frankly before Joe Howard was cast.
** When it was learned that ''Square One TV'' was going to be cancelled, Howard Meltzer, who produced the ''Mathnet'' segments, called up Creator/{{ABC}}, and suggested to them that they revive ''Mathnet'' as its own program. ABC was interested, but unfortunately, however, CTW vetoed the plan when they heard about it, because they would not have earned any money in the deal[[note]]This was because the ''Mathnet'' segments were not technically produced by CTW itself, but instead were produced by outside companies contracted by them. In the L.A. era, it was The Webb Organization, while in the New York era, it was Turtleback Productions in association with The Entertainment Group.[[/note]].
* WrittenInInfirmity: The likely reason Kate Monday is holed up in the "Mathnet" episode "The View from the Rear Terrace".
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