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Continuity mistake: When the POWs are preparing to move Dunbar, Sefton draws his pocketknife and throws it into the table, slanted, near a square etched into the tabletop. In the following shot, the knife is farther away from the square, and it stands up straight. (01:48:15)
Answer: The cast would have received copies of the script but with parts of the last scene omitted. They would be given the missing pages during the last days of the shoot, in which time they learn their lines, rehearse, then film the ending. Considering the time involved in filming a movie, actors do not necessarily memorize the entire script beforehand, but do so as each scene is shot. Also, it's questionable as to whether or not any of the cast did not know the ending as the movie was based on the Broadway play.
raywest ★