During the trial, the D.A. remarks to the jury that the defendant did not testify.
Since a defendant in a criminal case has a constitutional right not to testify, a prosecutor cannot make any reference to the exercise of that right. The judge would have declared a mistrial even if the defense lawyer (as in the movie) did not move for one.
When Nora and Talbot are driving across the bridge, near the end of the scene, cars are suddenly passing them on the wrong side going the other direction, and a sign for Old Gold cigarettes in the background is reversed, revealing the rear projection screen images have been flipped.