First appearance of Marty Smartypants ("Bill's Childhood Imaginary Friend"), touted by Bill as the smartest guy in the world. Now middle-aged, Marty, portrayed by Leila Gorstein, sports a five-o'clock shadow along with his crazy outfit of a bow tie, a propeller beanie, a loud Hawaiian-style shirt, and ill-fitting pants.
Regular cast member Goldie Fisher does not appear in this episode.
At the time this episode first aired, A Kiddies Kitty (1955) and Hare-Breadth Hurry (1963) had not yet been released by Warner Bros. on DVD or Blu-ray, though newly-restored prints were available on the HBO Max streaming service.