Acting for Two: John DiMaggio as General Julius Steel and Ilana's father, the King of Galaluna. He keeps popping up as extras all over the place, along with Tara Strong. Of course, with their wide ranges and main character positions, this isn't really too surprising.
Creator Cameo: In one episode, Genndy Tartakovsky voices a caricature of himself as a father comforting his crying son. The father even refers to his son as Jake, named after Genndy's real-life son.
Creative Differences: According to Genndy, a major factor in the network's lack of support was a shift in management during his time away, meaning that he wasn't working for the people who's trust he'd earned in the first ten years of his career. The whole exhaustive experience also caused the crew to simply lose interest.
Keep Circulating the Tapes: And how! The show is currently impossible to obtain legally, as Cartoon Network wrote it off for taxation purposes in 2014, therefore making it illegal for them to rerun it, release it on home video (except, for some reason, in Australia) or license it for streaming. In a pre-internet age, it'd be like the show never existed.
Kimmy is voiced by Cassie Scerbo in her first appearance in "Showdown at Sherman High", and then by Kari Wahlgren for the rest of the series. Both of them, interestingly enough, voice characters in Randy Cunningham: 9th Grade Ninja.
Young Lance is also voiced by different child actors in "Shaman of Fear" and "Shadows of Youth," although it could be that he's at a different age.
Screwed by the Network: When the creators balked at the idea of licensing the series for toy manufacturing (a unfortunate side-effect of an economic recession), the network swiftly canceled the series halfway through it's run. They then abruptly changed the time slot from Wednesday night to Saturday morning, ensuring that it could die quietly without it's fans knowing the truth and clamoring for its return, and eventually wrote the show off for tax exemption, removing any possibilities of reruns. The experience left the crew apathetic, and they all drifted from Cartoon Network to work on new projects.