Continuity mistake: When Nick checks on Albert after he knocks out Craig, during a close-up of Albert you can see that he reaches his hand up to his face. In the very next shot his hand's on his lap again.
Continuity mistake: In most scenes at Bangor airport the plane (L1011/Tristar) can be seen in the middle distance from the terminal window, but in one or two scenes it's right outside blocking the view.
Continuity mistake: When Craig Toomey jumps out and starts screaming at the blind girl, in the first shot he is holding the knife at shoulder level. In the following shot it is raised to eye level.
Answer: In the book he slaps her across the face during a heated argument. I can only assume that is what he is talking about.