In Future Schlock, Heffer and Rocko don't seem to have aged much or to be otherwise worse for the wear after seventeen years in space. If they traveled at relativistic speeds, more time would have passed on Earth than would have on the spacecraft.
Ed Bighead, a cane toad, has an adversarial relationship with Rocko, who's from Australia.
In Feisty Geist, Mortimer Khan takes over Filbert's body. Just as Rocko and Heffer prepare to squirt him with Spirit Away (TM) cream, he is already spirit free. They find him just washing his hands by the sink after using the bathroom. Mortimer surprise attacks Heffer as a toilet soon after. Mortimer didn't willingly leave Filbert's body, but passed out of him while he was on the can.
More Fridge Brilliance, Heffer comes across as gay or at the very least, asexual. He's able to talk to girls that make Rocko blush, and gets jealous if Rocko finds friends besides him. In a world where people are animals (and he's basically neutered), this makes perfect sense.
Dr. Hutchison lays an egg, even though she's a cat. This makes no sense initially, until one recalls that her father is a turtle. So Dr. Hutchison lays eggs because she's half cat, half turtle.
Dr. Hutchison at first glance may seem like an odd couple for Filburt, but they share quite a few things in common that some may take for granted. For one thing, both keep changing jobs and both have aform of handicap. Their lifestyles even complement each other, with the constantly ill Filburt (who keeps breaking out into hives) and Hutchison being a Doctor and Hutchison's purple clothing is even complementary to Filburt's green shell. And, last but not least, Hutchison's parents are also a turtle and a cat, which may make her attraction to Filburt inherited.
In one of the Early Episodes where Rocko gets fired and during his montage of Jobs is talking on a phone saying "Oh Baby, Oh Baby, Oh Baby" (See the Radar page for more details) He gets Mrs. Bighead and they both hang up on each other upon recognizing each other, a few episodes later we see the Bigheads Marriage is on the rocks cause she feels unloved. Understand why she called that hotline now?
Two words that would make that scene even more horrifying to think about: Chick Culling.
It's been implied, more than a few times, that Mr. Bighead is willing to kill Rocko and his friends just to get rid of them.
The Chameleon Brothers make and sell videos edited from their clients' raw footage without their permission. Rocko walks in just in time to see footage of him naked displayed in front of an audience, and the end of said episode has the gang accidentally obtain one of the Bigheads' private videos. How many customers' trust have the Chameleon Brothers violated this way, and how many videos of their patrons' intimate moments have they profited off of? Better question: Aren't they afraid they'll be sued or run out of town?
It's a cartoon. Yes, one that has more risque content than any adult cartoon on today, but it's still for kids and doesn't really go for realistic reactions to dubious problems.
As mentioned above, Heffer is a steer (which is a castrated male bovine). If he's castrated, then how was he able to feel aroused by the milking machine in "The Good, The Bad, and the Wallaby"?
Also, how was he able to provide DNA to Filburt and Dr. Hutchison's egg?
It's shown that an accident at Rocko's store caused the pink rabbit seen in some episodes (the one with his tongue sticking out) apparent brain damage, thus explaining why he appears like that. However, it's shown in an earlier episode (in a flashback no less) that he's had brain damage back then, too. Did he get cured only to fall victim to another brain injury?