At Scarlett's birthday party, while her father is giving his speech, there is a young woman with black hair in the back of the listening crowd. After he gives Scarlett the picture of the car, the scene cuts to Buck and his friend asking the same young woman to get them drinks. In the next scene, she is still in the back of the crowd on the other side of the room, and then once again talking to the guys in the next shot.
Before Henry's first night shift, he is wearing a blue shirt, which he presumably takes off to change into his uniform. When he is shown walking home the morning after his first night shift he is wearing a red shirt. After walking in the front door of his house and going to his bedroom, he is wearing the blue shirt again, which he pulls off, and collapses into his bed, exhausted, face down and shirtless. When he wakes up later that day, instead of being shirtless, he is now wearing a white t-shirt.
On Henry's first night shift Mrs. Silverman puts a pill in her mouth then takes out a bottle from her purse and open it, when the camera changes angle the bottle is closed again and the pill is gone and she open the bottle once more.