Hey, It's That Voice!: Gazpacho is voiced by Dana Snyder, most famous as the voice of none other than Master Shake, as well as Todd, though Gazpacho seems to have carried over the mother issues from Todd.
To add a little to the first example, Dana Snyder sounds EXACTLY like Master Shake in this show, and it can be quite jarring to hear that voice in a kid's show. Of course, it also makes it about 400 times funnier, since Gazpacho is a Cloud Cuckoolander just like Shake, and you could totally imagine either character saying quite a few of the same lines.
Chestnut's original voice actor was rapper/actor Tone Lōc.
Panini is voiced by Liliana Mumy, the daughter of Bill Mumy (who was in a lot of 1960s sci-fi TV shows, like Lost in Space and, most famously, the Twilight Zone episode, It's A Good Life, about a boy with omnipotent powers who forces everyone in town to be happy).
Mung's mentor is James Hong, who you might recognize from everything.
Oh hey Steve Blum, when did you start voicing Lemons that hate ninjas?
Keep Circulating the Tapes: Only the first 10 episodes were ever released to DVD, thankfully the Entire series is on iTunes and the Playstation Network. Netflix has also acquired the first 20 episodes making the first season.