Billy Wilder reminding one of the basics:

Four Billy Wilder Screenwriting Tips: (a) The more subtle and elegant you are in hiding your plot points, the better you are as a writer; (b) If you have a problem with the third act, the real problem is in the first act; (c) Let the audience add up two plus two -- they'll love you forever; and (d) The event that occurs at the second act curtain triggers the end of the movie.