In the scene in the auto parts store where Jack confronts Sandy, he asks her to write down the name of the guy who hired her (Jeb?). However at several points in the movie they make a specific point to show that he doesn't need to write things down to remember them.
He remembers the serial number from the sniper rifle after specifically stating that he doesn't need to take notes.
He specifically states that he doesn't need to write down the quarry address.
Is this simply a small plot oversight, or was he making a point when he asks Sandy to write the address down?