According to an interview with Emil Sitka, he described working with the Synchro-Vox system used by Cambria Studios on the series. He said that they used him when they needed certain accents or eccentric voices. He would have makeup applied around his mouth, as well as obtrusively bright lipstick on his lips. He would be strapped in a chair with his head in a brace so that he would remain in the same position. They would then film his mouth as he spoke his lines.
A clip from this series appears briefly in Pulp Fiction (1994). 'Emil Sitka', who voiced some of the characters in this series, also appears in the "Pulp Fiction", saying "Hold hands, you two lovebirds"--a line he made famous in 'The Three Stooges' short The Brideless Groom (1947).
Cambria Studios did considered suing Hanna-Barbera for their Jonny Quest (1964) cartoons, being similar to the Clutch Cargo stories, but it never happened. No lawsuits.