Continuity mistake: When Tom and Kate are looking at the photo album by the bed, at the start of the film, the pages they are looking at are inconsistent from each shot, evident by the suddenly changing photos.
Continuity mistake: When the Bakers and the Murtaughs are having the campfire singing contest, Tom is looking across the lake at the Murtaughs and his hair is slightly messy. When he turns back to his family in the next shot, his hair is neatly combed.
Continuity mistake: After Tom says he thinks Eliot is OK for Sarah, Between shots the ketchup bottle standing beside the mustard bottle vanishes then reappears.
Continuity mistake: When the Baker family first steps from their van at the lake house, the lake surface has lots of ripples. In the next shot, with no time for the waves to have calmed, the water is now glassy smooth.
Factual error: Eugene Levy brags that one of his children was a U.S. snowboarding champion in the slope style competition. The only snowboarding events that snowboarders compete in nationally are giant slalom and half pipe.
Continuity mistake: When the Baker and Murtaugh family are at the Labor Day Cup, they are in the tie breaker round in their canoes. Bud realizes that Nora's water broke, and Tom stops paddling and stands up to yell at Jimmy Murtaugh to stop. But when the shot changes to Jimmy, Tom is sitting down paddling.
Continuity mistake: When Anne is scared by Charlie, in the gazebo, she dries herself off with a towel, throws it to the floor then she dresses, and they walk to the bench. In the next shot you can see the towel is now hanging up over the side of the gazebo.
Continuity mistake: When Hillary Duff first picks up the baby in the hospital, his arms are at his side wrapped in the blanket. In the next shot, his arms are out of the blanket and by the side of his head.
Continuity mistake: At the start of the Labor Day Cup competition, a sailboat docked behind Eugene Levy has a plain white sail. With no time for it to have moved, a sailboat with a multi-colored sail takes its place.
Continuity mistake: During the tennis match, extra tennis balls appear and disappear on the ground behind Jimmy.
Audio problem: When Sarah Baker says "I mean we always vote on everything," her lips are out of sync.
Continuity mistake: When Charlie and Lorraine arrive at the lake house, the twins, Kyle and Nigel, who are both wearing blue, along with the rest of the family, go down the stairs to greet them. When it cuts to the wide-shot of the house, Kyle and Nigel have vanished, while Jake and Mike are shown beginning to descend down the stairs twice between shots.
Continuity mistake: When the baker family are at the Murtaughs' cabin, Tom Baker has wet spots on his pants, but in the next shot his pants are now dry.
Visible crew/equipment: When Sarah is fixing her hair at the car, you can see a crew member reflected on the door of the car.
Visible crew/equipment: When Kenneth and Mark are on the golf cart, you can see a crew member watching them.
Continuity mistake: When Tom and Kate are in bed discussing the upcoming Cup competition, Kate says "Give the kids some space," with Tom's head turned towards her. In the very next shot, he is looking down at his chart instead. (00:57:22)
