Revealing mistake: When Tom joins Sarah and Eliot for the kneeboarding, after Sarah apologizes for Tom's interrogation Eliot says, "It's okay, my dad would've done the same thing." Two shots later, as Tom grunts in the water, this shot is flipped - the driver is now on the left and the kids switched sides.
Continuity mistake: When Kenneth and Mark run over to the golf buggy, as they talk the position of the chinstrap hanging down from Mark's hat keeps changing from hanging down / hanging over his shoulder.
Continuity mistake: During the tennis match, Jimmy's and Sarina's long shadows are to their right, yet, Tom's and Kate's short shadows are also to their right, though the couples face each other on the court. (00:49:55)
Revealing mistake: Nora's (Piper Perabo's) pregnancy suit is sometimes distinguishable due to its different colour.
Audio problem: After Tom goes kneeboarding, as he gets off the boat and walks along the deck, in the background Eliot says "I'm sure you'll do better next time, Mr. Baker," but his mouth is closed.
Continuity mistake: Nora's labor starts and her water breaks in the canoe, yet when she is helped ashore minutes later her pants are completely dry.
Continuity mistake: Sarina's drink swaps hands as she sits down at the table on the decking.
Continuity mistake: When Tom holds little baby Tom at the end of the movie, the blue blanket is alternately covering/uncovering baby Tom's head.
Continuity mistake: After Sarah tells Lorraine to leave her alone, when Lorraine walks back to the table, in the first shot Tom is turned all the way round to his right, but next shot he is turned to his left. (00:46:20)
Continuity mistake: When Anne finishes drawing her portrait of Charlie, outside near the gazebo, her pencil immediately jumps onto the table without her putting it down.
Continuity mistake: When Nora's water breaks on the canoe, they take her to the river bank. Kate unclips her lifejacket in one shot but all the clips are done up in the next shot.
Continuity mistake: When the dog bounds underneath the long dining table, in following shots the remaining shattered glass and china changes position and amount, and the cloths, plates etc. all change position as they lay on the table.
Continuity mistake: After the pitcher of orange juice is spilt all over Kate's tee-shirt, the amount of juice staining the shirt changes from when it's spilt on to when she leaves the scene.
Continuity mistake: After Tom reveals Sarah's interest in Eliot, when Lorraine walks by vowing never to help Sarah again, Bud holds a burger in his right hand and a plate with a hot dog on it in his left. Next shot he's eating a hot dog with his right hand, while holding a burger with his left. (00:46:20)
Continuity mistake: After giving Sarah a makeover, for her date with Elliot, Lorraine's shoes change from flats to heels.
Continuity mistake: At the clambake, the waiter behind the table picks up a clamroll with his tongs. In the next shot it has vanished from the tongs.
Continuity mistake: When Bonnie Hunt is at the cutting board in the kitchen, between shots a sliced bagel moves around on a nearby plate.
Continuity mistake: When the Bakers and the Murtaughs are having their camp-outs by the lake, Tom suddenly has a pair of binoculars, which were not there before, so he can spy on the Murtaughs.
Continuity mistake: When Tom reveals that Sarah likes Eliot, Kate walks over holding a platter of burgers which change between shots. (00:45:35)
Continuity mistake: When Kate is slicing tomatoes, and is talking to Tom, she alternately holds a knife/a piece of tomato, and how far from the dicing board she holds the knife also changes.
