June 21, 1961 –
Walt Disney Productions released the original The Parent Trap starring Hayley Mills, (and Hayley Mills), Maureen O’Hara, and Brian Keith, in the US theatres, on this date.
The screenplay originally called for only a few trick photography shots of Hayley Mills in scenes with herself. The bulk of the movie was to be shot using a body double. When producer Walt Disney saw how seamless the processed shots were, he ordered the script reconfigured to include more of the visual effect.
The Haus of Dcaligari 