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I am not at all familiar with the film, but if google the differences between the play and the movies a variety of different suggestions appear. Sorry I couldn't be of more help.
it's raining at the end of the movie but not at the end of the play. The play ends with only two jurors left alone in the room, #3 and #8, and they exit. The last scene of the movie (according to Wikipedia): "As the jurors leave the room, Juror 8 helps the distraught Juror 3 with his coat in a show of compassion. The film ends when the friendly Jurors 8 (Davis) and 9 (McCardle) exchange names, and all of the jurors descend the courthouse steps to return to their individual lives."