 Susan Henning (qv) took on the role as Hayley Mills (qv) body  double for several of the twin shots in the film. As part of her  contract, she signed away her rights to be credited. At the wrap  party Walt Disney presented her with a small statue of Donald Duck,  called The Duckster, in recognition of the "best unseen performance  on film." Only 2 other Ducksters have ever been awarded. To her  credit, Ms. Henning did star with Elvis Presley later.