I Married a Witch inspired the Bewitched TV show. Bell, Book and Candle is also very similar. 

A gender bent adaptation of The Front Page. Switching Channels is a direct remake. 

Both romantic comedies feature chaotic couples falling in love again after cases of amnesia. 

Both are based off of the play The Parfumerie, which also inspired the MGM musical In the Good Old Summertime and the Broadway musical She Loves Me. 

Gene Kelly’s character, like Errol Flynn’s Robin Hood, is the blueprint followed by the leading men in The Princess Bride, The Pirates of the Caribbean, and Tangled. Gene Kelly’s character in DuBarry Was a Lady a similar character reminiscent of Robin Hood. 

Similar elements include green card marriage, the publishing industry, and a grandmother who helps get the couple together. 

Play loosely inspired by Pride & Prejudice, The Taming of the Shrew, and A Midsummer’s Night’s Dream.