After the success of The Rugrats Movie (1998), Nick and Klasky Csupo had plans to make a movie out of this show. However, production of the movie was shut down, due to the story being "too dark" for children. Information on what the movie was going to be about hasn't been revealed.
Unlike the majority of animated productions, the three principal voice cast members (Charlie Adler, Christine Cavanaugh, and David Eccles) recorded their lines together in the same studio. In a Nickelodeon interview, they claimed that this greatly helped their characterizations, as it allowed them to play off of each other more smoothly.
Originally, the Gromble's name was going to be the Womble. But the writers ended up changing the name to Gromble, to avoid a lawsuit from the writers of a British television show, called The Wombles (1973).