Continuité: 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.
Continuité: Kelly McGillis's Character is credited as "Kathryn Murphy", but after Sarah walks out of her office and the door is shut, we can see a sign on the office door with the name "Katheryn Murphy"
Divers: 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.
Continuité: When Kenneth Joyce is visiting his buddy in prison, the inmate is wearing a ring on his right hand. Of course, it got me thinking, can one actually wear a ring in prison? Someone involved in the film must have thought so also, as the ring disappears in the last two shots in the scene.