When Joanna's family is first moving to Stepford and they're driving up the long street that runs through Stepford, there is one shot of her husband looking out the window and taking in Stepford. If you look behind in in the car, there is no one else in it, even though Joanna and their children were there a second ago. In the next shot, there's Joanna, leaning against the window, which you could clearly see in the last shot, without Joanna anywhere near it.