A woman with a white hat is sitting at a table in the smoking lounge when Haines and Parks shuffle up to the bar. She is visible in all long shots, but disappears in all close-ups of Haines, in which she should still be sitting right behind him.
Steve is holding his hat differently between shots during the shouting match between Parks and Marchelli. He is also leaning against the bar differently.
During the pool scene, many bystanders are staring directly at the camera.
When he follows the other taxi a gaffer with a reflection board can be seen in his taxi's window.
While Haines, Gloria and the Steward, Gloria and her father are talking to the captain on the boat deck, the shadow of the microphone is visible on the top of the captain's cap.