When Winston is going to show Stella the room he made her for building furniture it is dark, but when Winston opens the door you can easily see that there is sunlight coming through the doorway.
While Stella and Winston argue in the restaurant, the level of wine in her glass keeps changing.
Near the end, when Stella goes to her mailbox the flag is up meaning there would be outgoing mail. However, she takes delivered mail out of the box and then puts the flag down.
The airport is LAX but the story takes place in the San Francisco area.
After questioning Stella, (Stella's youngest sister)about her new man, she tells Stella that she wants to hear more and to call her in the ambulance. She takes off in the Ambulance , and as she's driving down the driveway, it's clearly a man driving the ambulance.