Koosie making a pepé wrap is also an allusion to De Luise's second career as a cook.
Rasslor from the Dial M For Monkey episode of the same name was voiced by Randy Savage. His last line in the episode was, naturally, "OH YEAAAH!".
"Just An Old Fashioned Lab Song" is wall-to-wall references to guess star Paul Williams' music and personal life. They even got his car right!
Adored by the Network: Well not surprising considering it was one of Cartoon Network's first successful original animated series. But from 98-2001, it, along with Powerpuff Girls were the flagship shows of the network.
In fact, Hungary holds a reunion for the Sailor Moon cast: Dexter's first voice was Melvin; Dee Dee is Chibiusa; Dexter's first mom was Sailor Neptune; Mandark's first voice was Alan's second voice; and Dexter's second mom was Berthier, Karonite, Eugeal, Mimet, Telulu, Palla Palla, and Fisheye. Mandark's second voice is not Chad.
Keep Circulating the Tapes: Bits of the first season were released on a now out-of-print VHS tape, the same goes for a collection of Genndy's favorite episodes. "Ego Trip" was released only on VHS, and that's out of print as well. The first season did get an official DVD release, but it does not include the banned "Dial M for Monkey" cartoon "Barbequor". Thankfully, the entire series (sans "Barbequor" and "Dexter's Rude Removal") is available on iTunes, and the entire first and second seasons (again barring "Barbequor") are available on Netflix.
"Barbequor" is available on Netflix in the UK.
Missing Episode: "Dexter's Rude Removal", an episode the crew made for themselves as a joke which contained heavy use of profanity that not even Cartoon Network would find permissible. Before the end of 2012 it had been aired outside crew parties only once, at a Genndy Tartakovsky panel at a convention where they kicked out everyone under 18. [adult swim] released the episode for a brief period on YouTube.