Classic Films

...and I immediately thought it was yet another Hollywood version of Erich Kästner's Das doppelte Lottchen (Lisa and Lottie), which was the inspiration for both versions of The Parent Trap. However, Kästner's book didn't come out until well after World War II. So I wonder how many versions of the story exist and whether there is a source material I have overlooked.

And if that sounds ridiculous, consider that the musical Hello, Dolly! owes its existence to multiple plays from multiple cultures across at least two centuries.