Visible crew/equipment: When it shows Toomey's father sitting down with a newspaper, as he gets up to shout at Craig, a boom mike is visible, above him. (01:06:35)
Visible crew/equipment: In the scene where Albert hits mr Toomey, he falls to the ground out cold. If you look at the glass door to the right of Albert as he looks at mr Toomey on the floor you can see the reflection of a baggage car go past the door.
Visible crew/equipment: When Craig's father slaps Craig, and Craig then falls down to his knees on the floor, you can see a red tape marker on the floor by Craig's feet. (01:07:20)
Visible crew/equipment: At the end of the movie, when the people stand against the wall as they return back to normal time, you can see tape markers on the floor, as they stand by the wall. (02:55:15)
Visible crew/equipment: When everyone realises Toomey is on the runway and about to run past, Bethany, Rudy, Nick, Brian and Laurel are shown going outside to stand on the top of the airstair to see him. Just as Brian steps out of the plane, part of the boom mic can be seen entering the frame to the left of the shot. (02:09:36)
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.