Continuity mistake: Tom wraps a blanket around his waist at Sarah's beach house. He walks out to the deck and the stripes are wrapped differently. In the next wide shot it's wrapped as in the first shot. (00:09:35)
Continuity mistake: Tom slams his fist down on the answering machine, and in the close-up he picks up the machine with his fingers gripping the top of the machine. In the wide shot he holds the machine with his fingers on one side. In the next close-up his fingers are on top again. (00:05:55)
Continuity mistake: When Tom enters his apt, in the shot from upstairs a bowl of chips is on the corner of a white table and syrup, peanut butter, etc. on the other corner. In the shots downstairs, a pizza box is between the chips and syrup, the corner of which should be seen in the earlier shot. The position of the continents on the globe, the mail on the TV and the things on the plastic white shelves change between these shots too. (00:04:40)
Continuity mistake: Tom walks into his apartment with Kyle sleeping on the couch. The green strap of Tom's duffel appears and disappears on his shoulder repeatedly in consecutive shots. (00:04:40)
Revealing mistake: In the scene where Tom and Sarah first meet, Tom leans over her to see if she is okay. In the widescreen version of this film you can see a tree in the lower left corner of the screen. It is stated in the commentary that this was not shot on the beach, but in the park, which explains the tree.
Continuity mistake: In the beginning of the movie Tom and Sarah are on an escalator. At first Sarah is sttod a fair distance behind him, then as Tom gets off the escalator she is almost directly behind him. In the next shot when Tom throws the luggage cart, she way behind again.
Deliberate mistake: After dropping Sarah off at her parents' house, Tom deliberately smashes the flower pots with his car, as he drives away. It's very apparent that it's not Ashton Kutcher driving the car in these shots. (00:02:55)
Deliberate mistake: When Sarah is hit in the head with the football thrown by Tom, she slams down on her backside onto the beach. It is very apparent that it isn't Brittany Murphy taking the fall. (00:06:40)
Revealing mistake: While Tom and Sarah are at the Piazza in Italy, people either walk by or stand and stare right into the camera lens. (00:55:35)
Continuity mistake: Tom chases Peter down the stairs with a poker, in the first shot Peter knocks into the luggage at the bottom of the stairs near the two men and woman. In the next shot the woman and one man on the 'left' of the stairs changed positions and the luggage set up is different. (01:18:35)
Continuity mistake: When Tom and Sarah are at Pensione Funicello, Tom starts taking off his red sweatshirt and removes his arm from the remaining sleeve. In the next shot his arm is still in the sleeve as he tries to still take it off. (00:51:50)
Continuity mistake: During Tom and Sarah's wedding scene the mens' boutonnieres change between shots. (00:22:00)
Continuity mistake: Sarah points her finger at Tom and tells him that his nostrils always flare when he lies. In the first shot her white cuff is folded over the sweater but in the next side shot, still pointing, the cuff is down. (00:12:50)
Continuity mistake: When Tom returns to his apartment from the airport his friend is asleep in a chair with a sandwich in his lap. The sandwich is on top of a paper towel. He slides over and the sandwich is still in his lap but now covered by the paper towel. How did the paper towel get on top of the sandwich?
Continuity mistake: On their honeymoon, Sarah and Tom are lying in bed together in the Pensione, Sarah is wearing her necklace with the cross. In the next shot, the chain is there but the cross is not. Then in the next shot, the cross is seen back on the chain. Obviously in the middle shot the cross slid on the chain behind her neck and that is why it's not seen. (00:52:30)
Continuity mistake: After causing the electrical short at the Hotel DuReve, Henri goes with Tom and Sarah to their room. When he reaches the top of the stairs outside their door, he has two buttons closed on his blazer. Yet when he walks through their door he has only one button closed. His hair is different in both shots too. (00:41:30)
Continuity mistake: At the McNerney home, the family is gathered in the living room with Tom and Sarah. In the close-up Willie and Paul stand closer to the lamp between them, than they do in the wide shots preceding and following it. (00:14:10)
Continuity mistake: Tom and Sarah arrive at the Hotel DuReve and look out at the view. In the first shot the strap of her purse is on her shoulder, in the second it is at her elbow, in the third it's at her shoulder again. She does not touch it between shots. (00:36:25)
Deliberate mistake: When the blue car backs up and pushes Tom and Sarah's compact over the cliff, in the close-up the woman is seen, but in the next shot it is very obviously not that woman driving away. (00:47:50)
Continuity mistake: Willie tackles Tom and in the first shot he puts his right hand under Tom's arm, but in the next shot Willie's hand is first over, then he puts it under Tom's arm. (00:17:05)
