Continuity mistake: In the scene where the couples first attend Couples Skill Building, they are asked to line up on the beach. While walking off the deck and onto the beach, Cynthia removes her shoes (high heeled wedges), however the next shot when they are on the beach shows Cynthia wearing her shoes again. (00:34:00)
Visible crew/equipment: In the final scene of the movie just before the Jet Ski part you can see behind Vince Vaughn that there are two different screens making the blue cloudy sky behind them. To the left behind him there is a big puff cloud which is cut off with a smaller cloud to the right, leaving a straight vertical line between the smaller cloud and the larger cloud.
Continuity mistake: Vince Vaughn's guitar hero strap changes position after he puts it on. It goes from the outside of the strap (black) to inside (white) and back again in a very short time.
Continuity mistake: Dave is annoyed by his wife and friends not treating him like a shark attack survivor, and gets up and leave. When the whole table is in frame Kirsten Bell is drinking from her big glass, but the glass is firmly set on the table in the following shot.
Continuity mistake: At the beginning of the fish-feeding exercise, Jason Bateman sniffs his fingers and tosses the chum into the sea. Next shot and he has a couple of fishes in hand, and then switches again between a hand in the water or a hand on the buoy holding the live bait.
Continuity mistake: When the daughter of Lucy and Joey agrees to go change her skimpy clothes, there's a single shot of the whole room where Kristin Davis is wearing her hair over her right shoulder. Throughout the rest of the scene, before and after, her hair is worn all the way over the left shoulder.
Other mistake: The program the couple receives at dinner the first day has 6am marked as "Couples skill building", followed at 9am by "Dr. Marcel's activity." But all their mornings begin with Marcel's activity.
Continuity mistake: During the first scene with Jean Reno, Vince Vaughn's shirt has small but noticeable perspiration stains on the chest. They keep changing size and position between shots.
