Continuity mistake: In the scene with Adam Sandler, Bailee Madison and Griffin Gluck (the kids) when he is hugging them on the bed in the hotel room his arms are around their backs and his fingers are interlocked when Brooklyn Decker comes in. Then after he tells her he loves her and she turns to leave, the scene returns to him and the kids and shows that his hands are no longer touching and they are spread far apart on the kids' sides. (00:11:55)
Continuity mistake: When Eddie walks in to the doctor's office and talks to "brows gone wild" the woman with the green shirt has it kind of loose around her breasts. The next shot of her, the green shirt is tight and tucked into her pants/skirt. Then on her way out the door, the green shirt is loose, the same way as the first shot.
Continuity mistake: In the scene when the camera is panning over each character in bed (after Daniel has announced he's marrying Palmer the next day), you see Dolph sleeping in the bath tub. He rolls over and his arm falls into the toilet, and you can see that the seat is up. A moment later, the little boy sleep walks into the bathroom and sits on the toilet. Dolph's arm is still in the toilet, but the seat is now down.
Continuity mistake: When Adam Sandler returns to the hotel with Jennifer Aniston after their first real date they are standing by her hotel door and he has mysteriously grown a few days of stubble on his chin.
Continuity mistake: In the scene where Adam Sandler teaches the little boy how to swim, the little boy's hair changes styles.
Character mistake: In the scene when Jennifer Aniston is driving in the parking lot to take her kids to meet Brooklyn Decker, she is driving a Chevrolet. At the end of the movie, when she's confessing to Nicole Kidman, she states that she drives a Honda.
Continuity mistake: When Katherine and her kids arrive at JD McFunnigans, she drives in and parks in the parking spot at the correct angle. When the camera pans back after speaking to Danny, her car is now parked in a different angle, and not parked within the parking space.
Continuity mistake: In the scene when Jennifer Aniston and Adam Sandler are in the office talking, they are working with a female patient with a breast problem. Sandler is wearing latex gloves the whole time. At the end of the scene, he holds up the patient's bra and is not wearing the gloves anymore, but there wasn't sufficient time for him to have removed them.
Continuity mistake: When Palmer & Danny are waiting for Katherine to meet them at the hotel bar, Palmer has a red drink in front of her, but when they get up to greet Katherine, Palmer suddenly has a glass of coke or different kind of drink in front of her.
Continuity mistake: When Katherine is trying on shoes, they're blue. Then when Danny mentions they're her bonus, she says, "Then I'll take them in blue too in case I want to cuddle."
Continuity mistake: When Adam Sandler is on the phone with Jennifer Aniston talking about the dinner with Nicole Kidman he lies the phone on the couch. Next shot it is gone, then it is back.
Continuity mistake: When Danny is teaching Michael how to swim and has reached the farthest side of the pool, as Palmer and Katherine show up, Devlyn shows up and both children are gone by the time Palmer is pushed into the water.
Continuity mistake: When Palmer and Danny wake up on the beach and she finds his ring, she's wearing a single bracelet. Next shot she's wearing multiple bracelets, this continues throughout this scene.
Continuity mistake: When Katherine and Danny are putting numbing cream on Mrs Harrington's nipples, they are each using their right hands - one's numbing the left, the other on the right. The close up of Mrs Harrington shows a left and right hand, both on her left breast.