Continuity mistake: When everyone begins walking to Bangor Airport, in the wide shot Brian is behind the rest of the group. When the shot cuts, he is suddenly ahead of Gaffney. (00:58:27)
Continuity mistake: When everyone is looking at the empty airport reception area, there is a shot where Albert looks Bethany, and then she looks at him. The shot then cuts to Nick standing in the foreground of shot, and in the background, Bethany can be seen looking straight forward and not at Albert. (01:00:16)
Continuity mistake: In the reception area, after the frozen clock is shown, Dinah and Laurel hug. Dinah is placing her left arm around Laurel's waist. But in the next shot, her left arm is lowered. (01:00:25)
Continuity mistake: Bob removes the battery cover to a clock to see if the batteries are still inside. Once he removes the cover in the close-up shot, the cover is held so that it is pressed against the edge of the clock. When the camera cuts back to Bob, the cover is away from the clock. (01:01:40)
Continuity mistake: When Toomey's father is telling Toomey that the Langoliers will come for him, Toomey starts crying, saying "What can I do" and putting his hands on the front of his father's blazer. When the shot cuts, his hand is suddenly around his father's back. (01:07:50)
Continuity mistake: After Toomey starts crying into father's blazer, his father gets him off him by grabbing onto Toomey's blazer around his shoulder. When the shot cuts back to Toomey, the shoulder doesn't appear to have been pulled on at all. (01:07:55)
Continuity mistake: After Toomey has the imaginary confrontation with his father and hears Brian shouting his name, he has each hand on both sides of his face. In the next shot, his left hand is over his mouth and his right hand is over his left hand. (01:08:22)
Continuity mistake: Just after Toomey goes into the Airport Security closet, the others are shown walking up an escalator. In the shot from behind, when they reach the top, they are all shown standing one behind each other. In the next shot, Nick, Brian and Rudy are suddenly standing a couple meters ahead of the others. (01:08:55)
Continuity mistake: When Dinah is trying to explain that something is out there, Brian says to her it's just her imagination. Nick is shown next to him with his right upper arm at his side. Cut to Dinah, and Nick's right upper arm is suddenly extended slightly due to his hand being placed on his hip. (01:09:50)
Continuity mistake: When Dinah is trying to explain what she is hearing, as she is saying "I heard it when we got off the airplane, then I decided it was just my imagination", Nick is shown in the background looking at her. It then cuts to a close-up shot of her, and Nick is suddenly looking to the right. (01:10:05)
Continuity mistake: When Bob is asking Dinah if the sound is closer than when she first heard it, Laurel is standing right beside her with her arm around Dinah's shoulder. In a different angle, Laurel is suddenly standing with a slight distance from Dinah with her arm by her side. (01:13:05)
Continuity mistake: When everyone is in the airport cafe, just as Rudy goes to take a bite out of the sandwich, it seen in his right hand. When he spits it out a few seconds later, the sandwich is now in his right hand. (01:14:43)
Continuity mistake: When Rudy hands the sandwich to Bob for him to taste, he is shown holding a bottle of beer in his left hand, and his right-hand level with the left one. When Bob goes to spit out the bite, Rudy's right hand is suddenly at his side. Bob then says "That's not spoiled", and Rudy's right and left hand are level again. (01:15:05)
Continuity mistake: When Bob is explaining to Rudy that the sandwich isn't spoiled, Rudy is holding a bottle in his left hand. It cuts to Albert and Bethany for a few seconds. When it cuts back, Rudy's right hand is holding the bottle and his left hand is in his pocket. (01:15:15)
Continuity mistake: When Gaffney takes the bottle of beer off Rudy, he holds it in his right hand and takes a sip. He then turns to the bin to spit it out and moves the bottle to his left hand. In the close-up shot of him spotting the beer in the bin, the bottle has moved back to his right hand. (01:15:35)
Continuity mistake: There is a scene where Laurel, Dinah, and Toomey are in the Cloud 9 restaurant and everyone else is out by the windows looking at the plane. The camera cuts from the group out by the windows - which includes Gaffney - immediately to a shot of the Cloud 9 restaurant sign. You can see Gaffney inside the restaurant through the sign. (01:29:45)
Continuity mistake: When everyone is wondering what to do, Gaffney walks up to Brian and asks him what they do now. In the shot of Gaffney walking up to him, Brian has his left hand on the left side of his face and right hand on the right side. It then cuts to a close-up of Brian where his left hand is now on the right side of his face. (01:34:25)
Continuity mistake: When Albert lights the second match, in the close-up of his hand, he has the match placed between his thumb and index finger. In the next shot, it's between his thumb and middle finger. (01:37:50)
Continuity mistake: Brian tells Albert to crack open a can of soda. In the shot of him holding the can, whilst he uses his right hand to crack he has two fingers from that can, pressed against the side. Then there is a close-up of the can opening and those two fingers are now curled against the side. (01:39:58)
Continuity mistake: Dinah, Laurel, Bethany, Gaffney and Rudy go into the cafe to find Toomey no longer there. When Dinah deduces his location, in the shot of her saying "Behind something", Bethany can be seen behind Dinah, in between her and Gaffney. Gaffney then walks over to her and Bethany cannot be seen. When the shot cuts again, she can be seen behind Gaffney and should have been visible in the previous shot. (01:41:47)
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.