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)
Continuity mistake: When Dinah starts walking over the cafe counter to find Toomey, Rudy can be seen behind with his hands at his side. When it cuts to a wide shot of the cafe, he is suddenly holding onto back of a chair with his right hand. (01:41:52)
Continuity mistake: After Nick has finished explaining to Dinah that he has to get the blade out, in the close-up shot of Dinah while Nick says "Fold those two table cloths", Nick has his hand on top of Dinah's head. In the next shot, his hand is away from her head. (01:46:30)
Continuity mistake: After Albert knocks Craig Toomey unconscious with the toaster, as it shows different angles of him laying on the floor, his tie is alternately hanging out/tucked into his suit. (01:48:55)
Continuity mistake: When Albert strikes Toomey with the bag for the last time, in the shot of Toomey turning around after getting struck, Albert is holding the bag with his left hand. When Toomey lands on the ground in the next shot, Albert is suddenly holding the bag with both hands. (01:49:18)
Continuity mistake: When Bethany meets up with Bob, and they wonder where everyone is, Bethany is shown putting a cigarette in her mouth. The cigarette is straight and unbent when she places it in her mouth, but in the next shot, the cigarette is suddenly bent slightly. (01:52:20)
Continuity mistake: When Albert is explaining to Nick how Toomey killed Gaffney, in the shot where he says "If I'd have walked in first he would've killed me instead", he is looking straight forward. When the shot cuts, Albert is suddenly looking at Nick. (01:53:25)
Continuity mistake: Albert knocks Toomey out with a toaster. You can see during several subsequent shots that there is only a small amount of blood on Toomey's forehead and none at all on his face. Toomey lies there unconscious for a while, without changing position, and when he wakes up, suddenly his whole face is cut up and bloody. (01:54:00 - 01:59:05)
Continuity mistake: When preparing to fuel up the plane, Bethany bends down and opens the fuel tank. Once she stands back up, her back is hunched forward slightly, her right arm is in a reaching position and her leg is bent. When the shot cuts, she is standing fully upright, her arm is no longer reaching downward and her leg is unbent. (02:01:10)
Continuity mistake: When Dinah projects the image of the board room into Toomey's mind, there is a moment where he trips over a few meters away from Albert and Bob. After Dinah tells him to keep running, there is a shot of Toomey continuing to run. But a couple seconds after that, it's shown that he hasn't even ran past Albert and Bob yet, even though he wasn't far from them a couple seconds ago and kept running. (02:09:10)
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)
Continuity mistake: When Toomey is about to tell the board room how much money he made, he says "I didn't make any", before being interrupted by his father's voice. He grabs onto the side of his head and points his head downward slightly. In the next shot, his head is suddenly pointed down further. Then in the shot after that, his head is back to its original position. (02:10:35)
Continuity mistake: When Toomey's father is telling Toomey to tell the board room that he lost the money and that it was a mistake, in the shot from behind Toomey, his hands are placed flat over his ears. When the shot cuts back to him, it is now the sides of his hands over his ears. (02:10:41)
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.