Corrected entry: In the scene in which Hallie is piercing Annie's ears, she puts an apple under her ear to make it easier to get the needle through and to make it less painful for Annie. However, apple juice is highly acidic, and once the lobe was pierced, it would have reacted with the apple, making it extremely painful (moreso even than was demonstrated by their screaming).
Corrected entry: In the shot where Meredith's air-bed is seen in daylight, having been on the water for a few hours, the lake is flowing at about 5 or 6 knots from left to right, yet she is in plain sight of the camp site. Even more so her air-bed doesn't seem to be moving with the current (thus defying the laws of physics). If she really was left on the air-bed for that long she would be a few miles down stream by the time she woke up.
Corrected entry: In America, when Annie is with her dad pretending to be Hallie we understand that she has been at camp for 8 weeks. But in England when the butler goes into the room where Hallie, her mom and grandfather are eating and he is holding the 911 message from the fax machine her mother says really, Annie, 6 weeks is too long to be at camp. So how long were they at camp? 6 or 8 weeks?
Corrected entry: Before Annie reveals to Chessy that she isn't really Hallie, Chessy starts to say "It's almost as if you were Annie." Chessy has not been around Annie in the past several years, so she should have no idea how Annie acts, what she likes, etc. Elizabeth has obviously not kept Chessy up-to-date on Annie, because at the hotel, Chessy is not sure if Elizabeth remembers her. This shows that they have not kept in touch over the years.
Corrected entry: After the poker game at camp, when Annie is naked and about to jump into the lake, she has left her locket on. There is plenty of moonlight out, so Hallie could easily notice that Annie has the same locket as her, yet there is no indication of her seeing it.
Corrected entry: Annie and Hallie are saying goodbye, Annie's car shows up and Annie (as Hallie) gives Hallie (as Annie) her ticket and passport. Hallie (as Annie) then asks what time the real Annie leaves and she replies, "Oh not for a couple of hours." Wouldn't Hallie know this, as they were her own return arrangements before she switched places with Annie?
Corrected entry: In almost all the scenes in London, the cars are driving on the right side of the road. Aren't the cars supposed to be at the left side?
Corrected entry: Throughout the fencing scene, Hallie and Annie switch accents. Hallie's wearing the green fencing outfit and speaks with an English accent at certain points, although she was the American girl.
Corrected entry: They go to camp for eight weeks, and when Hallie comes back to England (in Annie's place) she and her mother still have time to go out and go shopping. The English school summer holiday is only six weeks - not enough time.
Corrected entry: Before piercing Annie's ears Hallie sterilises the needle by holding it in a flame. However, as the needle's metal and her fingers are unprotected, the heat should travel up the needle and burn her fingers.
Corrected entry: When Hallie(the tom boy) is cutting Annie's hair, Annie has her hair tucked behind her ear. Hallie then sizes up the shortest piece of her hair then cuts Annie's hair accordingly, but Annie's hair is still behind her ear, so the shortest hair would be in the wrong place.
Corrected entry: When Annie and Hallie are teaching each other about their lives in London and Napa, there are two posters hanging on the wall with floor plans of their houses. One is titled "Annie's House" and the other is titled "The James Residence" but their names are Annie James and Hallie Parker. (00:38:00)
Corrected entry: When Annie is going down the dock naked, somebody in the background whistles and says, 'OOh, ooh, Parker,' but Annie's last name is James. Hallie's is Parker.
Corrected entry: When the girls are in the isolation cabin Annie's light switch is up but the next time you see it it's down. She never turned it off.
Corrected entry: When Hallie begins to cut Annie's hair, starting with the bangs, she cuts them about at the eyebrow line. After she's done cutting all of her hair, Annie's bangs are at the middle of her cheek.
Corrected entry: Well, when Hallie and Annie take their parents on the Queen Elizabeth II and are recreating the night they met, there is an inner tube above the dinner table reading, "Queen Elizabeth II" and underneath it the year 1986, supposedly the year they met. However when the parents are in Nick's wine cellar and he is showing Elizabeth his collection of his parents wine, he has one from 1983. She asks him what is so special about that wine and he says it's the year we got married! How the heck do you marry someone in 1983 when you haven't met them until 1986?