When Sarah, after the rape, goes back to The Mill, her red car is first shown dry and shiny and without a rear license plate. A few seconds later, in a close-up shot, we see the same car is wet from rain drops and with the license plate 'SXY SADI' on the back.
In both scenes when characters are playing the pinball machine we can hear the ball rolling around, scoring points and making the usual pinball machine noises but the score on the machine never changes.
When Bernie Coulson visits Steve Antin in prison they talk through telephones with a glass barrier between them. Yet, the whole conversation is heard through the telephone whether the scene is shot from the side of the speaker or not.