At the film's premiere, as the movie neared its third hour with the end not yet in sight, comedian Mort Sahl stood up from his seat in the packed theater and shouted, "Otto, let my people go!" The incident quickly became a popular piece of Hollywood lore.
When Paul Newman gets out of the car, his head hits the corner of the door and he touches his forehead. The passenger, Eva Marie Saint, hardly held from laughing.
When parking because of traffic, the car carrying Peter Lawford and Eva Marie Saint, bumps into another parked car. When Peter Lawford gets out of the car, the car is seen parked with some space in between.
Nurse Kitty Fremont inserted the earpieces backwards when listening to hear if heart sounds started after the epinephrine injection into Ari Ben Canaan's heart. The earpieces should point to the front in line with the ear canal's angle.