Berkeley Breathed was exceptionally displeased with the quality of the final product. In an exchange published in the Washington Post he said to a person trying to find the VHS or DVD version, "Hopefully [you will find it] in the rubbish pail. We can do better than that and we will with an eventual Opus film...but I'm glad you enjoyed it. I presume your family was on speed when they watched it. I would imagine it helps."
During the production of Hook (1991), executive producer Steven Spielberg decided to utilize lead actors Robin Williams (The Kiwi) and Dustin Hoffman (The Cockroach) to record (in what little time he had) their voice-over work in a small studio. This is why both A-list stars were available for this animated special. It is also the reason why the quality of their voice recordings isn't as clear as the rest of the cast.