ENjoyed seeing WITNESS FOR THE PROSECUTION on DVD again after a too-long absence. Not the greatest transfer in the world, but I certainly appreciate having it full and complete.
(spoilers)
I have done the play twice (once as Carter, once as Vole), and all three of the major surprises at the end of the movie are in the play, too: Vole's guilt, Christine's (Romaine in the play) admission of being the mystery woman, and Vole's murder by his wife. The film is different only in that Sir Wilfred is going to represent Christine in her trial for murdering Leonard.
Can those who were saying the film's ending was so different make it clearer what is different? Of course, the short story that Christie first wrote is vastly different in that the only surprise there is that Leonard is guilty, not innocent, of the crime, but the play greatly expands on that surprise with additional twists.