Ronnie SchellRonnie Schell, who provided the voice of the title feline, was also given the small part of an army sergeant. In post-production, it was decided that his voice was too easily recognizable, so the on-screen role was re-dubbed by another, unidentified actor.
Harry MorganHarry Morgan plays an eccentric general and McLean StevensonMcLean Stevenson plays a harried doctor. In Harry MorganHarry Morgan's first appearance on [M*A*S*H], he played an eccentric general; McLean StevensonMcLean Stevenson was a regular in the role of the harried doctor in command of the 4077th.
Jake the cat was played by two different Abyssinian cats: Rumple and his sister, Amber.