Five years before her break-out role as Mattie Ross in True Grit, Kim tested for the role of Liesl, the eldest von Trapp daughter.

Agent Sue Mengers reportedly fought tooth and nail to get the role for Darby and not Minnelli to the chagrin of Menger's employers (who also represented Minelli).

Kim Darby was considered for the role of Judy, but lost interest when Barbra Streisand was interested to take the role.