William Katt, who played Martin Wadsworth, is the son of actress Barbara Hale, who played Della Street on the TV series "Perry Mason". He would go on to star in the TV series "Greatest American Hero".
Joyce Bulifant, who played Peggy Lakes, is the ex-wife of William Asher, who was the ex-husband of Elizabeth Montgomery, star of the TV show "Bewitched".
Elinor Donahue, who played Ellie Tarlow, previously played Betty Anderson on the TV series "Father Knows Best".