This episode revealed that this is how Dexter and Mandark first met, however in the episode "A Boy Named Sue", it shown that they met in a different way. This was likely a continuity error.
In the episode "Mandarker", Mandark said that Dexter destroyed his lab even though it was really Dee Dee who destroyed his lab.
A future episode known as "Dee Dee's Rival" is a spin-off version of this episode showing Dee Dee meeting Mandark's sister Lalavava.
Production code is 101.
In a quiz session, Mandark says that Thomas Jefferson wrote the Bill of Rights. Jefferson was serving as U.S. Ambassador to France at the time. George Mason wrote the Bill of Rights.
Although "Dexter's Rival/Dial M for Monkey: Simion/Old Man Dexter" is aired on May 12, 1996 in the U.S. on TBS and Cartoon Network, It was actually the first part o the first produced episode produced in the same year according to the credits, creating a continuity error in the American broadcast.
When "Dexter Dodgeball" was aired in 1996, "Dexter's Rival" is actually the first produced episode aired out of order, in fact, Dexter's first at school is actually in the episode "Dexter's Rival", when Mandark made his first appearance.
Although this episode is aired on May 12, 1996 in the U.S. on TBS and Cartoon Network, It was actually the first part of the first produced episode produced in the same year according to the credits, creating a continuity error in the American broadcast.
This episode was supposed to be the first one to air because it was produced first, but because Cartoon Network often airs episodes out of production order, it aired third.
One of the questions that Mandark answers is "What is the name of Neptune's moon?"; Neptune has eight moons. Mandark answers Triton which is in fact one of them.
Mandark says to Dexter "Some kid told me you have a laboratory." Even though Dexter's Lab is supposed to be a secret.
Mandark says Thomas Jefferson wrote the Bill of Rights, even though it was James Madison who did that.
This episode revealed that Mandark had the ability to read minds, however this was abandoned throughout the rest of the episode and the series.