- 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).
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