Aphron has revised the script several times. During the creative process, every time he wrote inadvertently, Aphron would interview the employees of the production company. Some of the interviews were later interspersed in the film, but they were all performed by the actors and re-edited. Many of the lines in Ephron's script are based on the dialogue between Reiner and Christo in real life.
At the beginning, Ephron planned to name the movie "How They Me" and changed multiple titles. Rainer even launched a competition among the crew for the subject: the one who came up with the title could win a box of champagne. When Billy Christo signed to be the lead actor, the title was "Boy Meets Girl". In order to show Harry's lonely mentality when he was single after his divorce, Christo would stay in a room alone during the filming in Manhattan, rather than with other actors. In the beginning, the ending of the script was that the hero and heroine were still friends, and the romantic relationship was not further developed, because the screenwriter and director felt that this was the "real ending". In the end, the two realized that it would be more appropriate for Harry and Sally to marry the ending, although they both thought that this result was usually unrealistic.
