The screenplay originally called for only a few trick photography shots of 'Hayley Mills (I)' in scenes with herself; the bulk of the film was to be shot using a body double. When Walt Disney saw how seamless the processed shots were, he ordered the script reconfigured to include more of the special effect. The title song was performed by Tommy Sands and Annette Funicello. They were on the lot shooting Babes in Toyland (1961). For the scene were Maureen O'Hara and Charles Ruggles are spea ...[Read Story ]