I recently bought season one of this show and having seen it, I can't believe that Nickelodeon got away with so much stuff we can't show in kid's cartoons today without at least (I think) a TV-PG rating.
If any of you did your research, the recently released DVD is not "intact" as far as content goes. One scene in "The Good, the Bad, and the Wallaby" is completely removed as it showed, when it first aired and since has had this correction, Heffer experiencing pleasure with a milking machine.
In "Skid Marks", the driving school that Rocko goes to has a watered-down video of a simulated car crash using tomatoes. The students cheer before the clip is shown and cry after the wreckage.
In "Bedfellows", there is a short clip of a nudist colony formed in Rocko's backyard. What has been done is that every time the offending body parts might come into view, an object quickly blocks those parts. The censoring for nudity is a bit inconsistent. Rocko can be seen fully nude in a shower scene in one episode but then is censored in another after an animated censor spots the problem and puts a black box in front of the offending areas; at one point the box falls done when we see Rocko face-first.