Walter Kerr did originate the review, but it was for John Van Druten's play "I am a Camera." The review was published on December 31, 1951, which was four years before the release of the film of the same name.
Van Druten based his script on Christopher Isherwood's book "The Berlin Stories," hence Isherwood wrote neither the play nor the screenplay.
John Collier wrote the screenplay, though Van Druten and Isherwood receive credits for the source material.
Ironically, the abysmal work was later adapted into the wildly successful 1966 Broadway play "Cabaret" and its similarly successful film counter part in 1972. Joe Masteroff wrote the 1966 play (from an adaptation of the Van Druten material by Sandy Wilson), with John Kander and Fred Ebb writing the lyrics and music. Jay Presson Allen adapted the screenplay, which also credits Isherwood, Van Druten and Masteroff.
All sorts of n'erdowells plagerize the quote, hence the reason for any various attributions.
http://www.fwfr.com/display.asp?ID=4088
