This is the first of two appearances by Jean Vander Pyl as Penny's mom. She appears a total of five times in the series. She is perhaps best known for her voice credits in multiple cartoons, particularly as the voice of Wilma in the animated TV series The Flintstones (1960).
In this episode, Ward's car clearly has a California license plate on the rear, seen as the boys are pushing the buggy into the garage.