Keep Circulating the Tapes: When Nickelodeon was releasing their back catalogue of Nicktoons in the late 1990s, this one and KaBlam! were the only ones to not get any VHS releases. It wasn't until Shout! Factory came along that the show got a commercial release, now in complete series form.
Missing Episode: "Bye Bye Beavers". Audio tracks have been found, but there presumably isn't any animation to go with it. Its companion episode, "A Tale of Two Rangers", was apparently never even finished.
One-Hit Wonder: Norbert and Daggett never do produce another hit beyond "Beaver Fever" in the episode of that name, and eventually their spotlight is taken by Barry.
Throw It In: Most of the dialogue. Although there were scripts, Mitch Schauer provided a relaxed environment for the voice actors, which enabled Nick Bakay and Richard Horvitz to ad-lib and talk over one another. It eventually became the norm, which got Mitch into the habit of informing other voice actors of the duo's improvisational habits.