Due to contract reasons, the Laff-A-Lympics did not include several cartoon characters who were originally intended to be in the show. These characters include Jeannie (whose character rights were owned by Sidney Sheldon of the original "I Dream of Jeannie" television series), Dick Dastardly and Muttley. However, HB was able to skirt around the last two names mentioned, slightly redesigning their characters and altering their names just enough to avoid issues with copyright law. Dick Dastardly was renamed "Dread Baron" and Muttley was renamed "Mumbly" for this reason.
More info regarding this can be found here.
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