Executive Meddling: According to one animator the bulk of the more vulgar and offensive jokes were at the insistence of producer Lawrence Kasanoff (who also served as the film's director, co-writer and the voice of Cheasel).
Plus, there's a review of the film on the British website of Amazon that mentions something suspiciously similar to the testimony above... and the reviewer himself claimed to have worked on the very film itself.
Christopher Lloyd in particular is clearly recycling his voice from Cyberchase.
Old Shame: Much of the staff regrets their involvement with the film. Many were unaware that they or their co-workers were turning in a final product, and at least one member admits he doesn't include it on his resume.
Various pre-release hype will tell you that up to 80 mascots and products were originally going to appear in the film. Some of which who didn't appear in the final film include (but are not limited to) the M&Ms, Chester Cheetah, the Trix Rabbit, Sugar Bear, the Coca-Cola Polar Bears, the Lucky Charms Leprechaun, Captain Crunch and the Alpha-Bits Pals. Several obvious stand-ins for them appear at the club.