Show Business: Springtime for Hitler

It may all be Zero Mostel's fault.

In the 1968 film The Producers, he played a zany impresario dedicated to staging a Broadway musical called Springtime for Hitler, a rococo recounting of the good old days in the Thousand Year Reich. Against all expectations, Mostel's musical was a smash —which turns out to have been prophetic. In the entertainment world nowadays, Hitler's springtime does indeed seem to have arrived.

In London, the cameras are turning on Hitler—The Last Ten Days, and Sir Alec Guinness, complete with toothbrush mustache and special black hair piece, is...