Philbert was a hybrid live-action/animated produced by WB for ABC, which passed on it. Rather than shop it around, the studio did some editing, and reissued Philbert as a 26 minute short subject in theatres.
Had it worked, William Schallert (ex-Dobie Gillis) might not have landed a role on The Patty Duke Show in the fall of 1963. Friz Freleng not only directed the animation, but wrote the story, too, a rare case of Freleng writing for live-action.