- Ear Worm: Some of the music videos are still stuck in people's heads 25 years later. Nine nine nine...
- "I... am a neighborhood superspy. (Superspy!) I... am an undercover kind of guy. (Undercover kind of guy!) I... should be working for the FBI. (FBI!)"
- "Probability / Dont you mess with me / Help me make the most of a chance / Might be win or lose / Still Ive got to choose / Long as theres a ghost of a chance"
- "Estimaaaaation - when the answer doesn't have to be exact"
- "You'll never reach infinity, it just goes on, and on, and-on-and-on-and-on..."
- The musical number performed in Mathnet's "The Case of the Unkidnapping".
- Magnificent Bastard: Mr. Glitch once goaded Mathman into a long rant, getting him to ignore the time limit.
- Memetic Mutation: One One Two Three
- Five Eureka!
- Moment of Awesome: Any time Mathman won a free game would be enough to qualify, but the segment where he successfully argued against Mr. Glitch's claim that arithmetic and mathematics were the same thing deserves special mention.
- Glitch got Mathman back in a later episode, where he successfully provoked Mathman into going into a rant about how every occupation uses math in some capacity... before revealing that he agreed with Mathman all along, but just wanted to distract him from the time limit clock that just expired. Game Over.
- The ending of "The Case of the Unkidnapping", in which the cast investigates the criminal on-stage, singing and presenting it as a big musical number.
- Nightmare Fuel: Mr. Glitch was an anthropomorphic tornado who would eat Mathman if he got a question wrong and even once, when Mathman got it right.
- And once for absolutely no reason at all. That time, he filled the whole damn screen.
- There was also one time when the roles were reversed and Mr. Glitch got to run the maze. In the end, after his (inevitable) failure, Mathman ate him ''one bite at a time.''
- And let's not forget the immense creepiness of the battles between the pluses and minuses... A visceral testament to the simplicity of arithmetic and the futility and horrors of war.
- The "Ghost of a Chance" video. The whole concept of a pizza delivery boy getting trapped in a haunted house forever, unless he gets very lucky making a series of random guesses (to teach probability), is nightmarish enough, but then you have real footage of thousands of worms crawling over each other and an endless hallway with "EXIT?" signs over an endless number of doors. He picks the wrong one.
- Two words. ANGLE. DANCE.
- Retroactive Recognition:
- Reg E. Cathey, of The Wire, House of Cards (US) (2 Emmy nominations), and Fantastic Four (2015) as one of the repertory players.
- 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.
- Gary Owens, alias the title character in Roger Ramjet, as Lt. Dirk Niblick of the Math Brigade. (Furthermore, like Roger Ramjet, the Dirk Niblick segments were written by Jim Thurman and animated by Fred Crippen.)
- Jim Thurman as Glitch in the Mathman segments and as supporting characters in the Dirk Niblick segments.
- First-season 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 and also co-created The Puzzle Place. Pat Tuesday and George Frankly even appeared in a first-season episode of Where in the World.., in which they gave out clues to the gumshoes to where the crook had gone.
- The voice of Lisa Simpson, Yeardley Smith, has a guest starring role as "Jane Rice Burrows", the teenage friend of the gorilla Grunt, in the Mathnet story "The Problem of the Missing Monkey".
- Suspiciously Similar Song: An episode of Mathnet dealt with popular music. Rocker Steve Stringbean was slated to perform at a parade, but then he was kidnapped by two failed Michigan State Marching Band musicians named Floyd Tyrone and John Phillips Lousa. Stringbean's song, which was also the kidnapper's telephone number was "Please do what these people say", which sounds very similar to Springsteen's "Born in the U.S.A."
- Wheelchair Woobie: In one Mathnet week, Kate Monday was in a wheelchair. It made you feel sorry for her, and it made her a Damsel in Distress at one point, too. Neither the audience nor the other characters ever learned just how she got injured; she said on-screen that it was embarrassing in response to being asked about it.
YMMV / Square One TV