 Connelly and Mosher were charmed with Mathers' innocent candor and cast him in the title role.Barbara Billingsley, an actress with experience in several B movies and one failed television series ("Professional Father"), was then hired to play Beaver's mother, June.Preteen Tony Dow accompanied a friend auditioning for "Johnny Wildlife" to the studio, and, although Dow had no aspirations to an acting career, tried out for the role of Beaver's brother, Wally, and was hired.