At the dressmaker's shop Julie holds up the red dress in front of her to see how it looks. It has sleeves. She takes it home with her and shows it to Preston. The next day is the ball and when she appears in it, the dress is now sleeveless.
Early in the film, Preston storms up to Julie's bedroom and knocks hard on her door several times with his cane. The head of the cane seemingly leaves numerous dents in the wood. When Julie finally opens the door (inward into the bedroom), the dents have disappeared.
When Zette admires Julie's dress, the apron on her uniform is pinned to the uniform in some shots and unpinned in other shots.
When Preston collapses in the cafe, Livingstone is trying to get him and asking others to help. In close-up he is holding Preston's arm, but in the wide shots Preston just lies on the floor.
As Mrs. Kendrick and Stephanie go up the steps to the porch of Julie's house, a diagonal ray of light shines across the front door. Just before Uncle Cato opens the door, the light is gone.
Preston Dillard is seen entering a street level door, then going downstairs to the gentlemen's bar. New Orleans has a high water table, so buildings do not have basements or lower levels.
In all the swamp scenes, only one solitary frog is heard croaking.
In the scene in which Julie is sewing her dress she hums "Beautiful Dreamer". The story takes place 1852-53 and "Beautiful Dreamer" wasn't written until 1864.
When the sheriff shoots the "yellow jack" runaway at Halcyon Plantation, he uses a lever-action repeating rifle. This type of weapon was first patented in 1860; the action takes place in 1853.
When Preston comes for the first time to the house with his wife, Julie leaves her room and starts going down the stairs. The boom mic is visible. And then at the next scene from a different angle, the boom mic and the crew-member's head is visible through the second floor railings.
As Julie hurries through the room arranging flowers, one flower falls out of the vase, but she doesn't bother with it or even seem to notice it, continues arranging them, and then moves the vase to another table.