In the scene when Midge and Benjamin are at the Stage Deli, Midge's coffee cup is full through most of the scene, and then all of the sudden a few seconds later it is empty. It then returns to full again a few more seconds later, even though the waitress hasn't come to the table.
Outside the theatre a male extra is seen shaking hands in the lobby over her shoulder then as the camera angle changes he is over her dates shoulder on the street during the same conversation.
"The Legend of Lizzie" opened on Broadway at the 54th Street Theatre on February 9, 1959 and closed the following night after a total of two performances. So it was not running in the summer when Midge comes back to New York City from the Catskills. The play was nominated for a Tony Award for Best Scenic Design and including in the cast was William Daniels as Assistant D. A. Cooper. Anne Meacham played Lizzie Borden.