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Trivia: Square One TV
  • Hey, It's That Guy!:
    • In the original Los Angeles-based episodes of Mathnet, the chief, Thad Green, was played by James Earl Jones. Despite a change in chiefs with the move to New York City, Jones made one appearance via phone in a season 4 episode.
    • The Mathnet segments in particular featured a number of notable cameos from people in the world of music, television and theater. Yeardley Smith, "Weird Al" Yankovic, Marcia Wallace, and Dick Sargent and McLean Stevenson (as rivals in the same episode), just to name a few, all appeared.
    • This also applied to people working off camera. First- and second-season writer David Yazbek later co-wrote the theme songs to Where In The World Is Carmen Sandiego and Where In Time Is Carmen Sandiego. Pat Tuesday and George Frankly even appeared in a first-season episode of the former, in which they gave out clues to the gumshoes to where the crook had gone.
    • One of the regulars in the non-Mathnet sketches, Reg E. Cathey, later turned up on House of Cards (US) as restaurateur Freddy Hayes.
  • Hey, It's That Voice!: Gary Owens as Lt. Dirk Niblick of the Math Brigade.
    • Jim Thurman as Glitch in the Mathman segments and as supporting characters in the Dirk Niblick segments.
  • Keep Circulating the Tapes: The series has not been rerun since the early 2000s, when it was rerun on Noggin, and there are currently no DVD releases planned. Domestic recordings do exist of many episodes, and they sometimes show up on YouTube, but they are nowhere near exhaustive, and quality varies widely.
  • Too Soon: An exception - not long after the September 11 attacks, Noggin aired an unedited episode in which George Frankly casually discussed having dinner at Windows on the World at the World Trade Center.

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