Even though Elinor Donahue plays a very major role as Ms. Walker, she is uncredited.
Once again, in spite of Elinor Donahue's character's name ("Ellie") being in the episode title, Elinor herself is not credited. This same thing happened in a previous episode where Ellie was running for Town Council.
Although Elinor Donahue, who plays Ellie Walker, is not listed in the credits, her last name appears in a nod to her wardrobe provider ("Miss Donahue's Fashions - MR. BURT of Encino").