Continuity: When the twins are standing on the steps of the isolation cabin, talking about their familes, Hallie, one time is not looking at Annie - her eye-line for the special effect is off.

Continuity: When Hallie and Annie get out of the water bin after their fence match, they both take off their helmets, revealing Annie's messy hair. In the next few scenes, you see the hair a little less messier than before and neatly pulled back.

Continuity: When Annie and her friends are approaching the area where the fencing is taking place, all three girls are holding tennis rackets. The shot switches to the camp counselor and back to the girls. The African American girl is no longer holding a tennis racket. The shot goes back to the counselor and then to the girls again, where all three have a tennis racket again.

Factual error: In the scene in which Annie and Hallie are fencing, it portrays it as though Annie does not win until she hits Hallie (effectively knocking her into the water). However, in a real fencing match, Annie would have won within a few seconds after they started. Once a person is backed off their end of the strip, their opponent automatically gets a point.

Continuity: In the opening scenes when you see the limo pulling up to let Annie and Martin out you see the pavement to the right of the limo has a lot of sunlight on it. When they get out and are standing on the pavement, the sunlight is gone.

Continuity: In the opening scene, they show the lake and the little sign that says Camp Walden. There are boats under a roof top right in front of the pier. But in the scene where they show Annie jumping into the lake the boats are in a different location and the roof top is gone.

Continuity: When Annie and Hallie are playing poker, Annie puts down a pound. In the very next shot, when Hallie puts down a $10 bill, the pound is gone. There wasn't a big enough pile of stuff yet to hide the pound.

Continuity: I the scene where Hallie and her mom are having tea, you can see a watch on the mom's wrist. After Martin hands Cuppy to Hallie, in the next shot of her mom, there is no watch.

Revealing: When Hallie and Annie are fencing with each other, Hallie forces Annie's sword into the air, and Annie runs towards the hay stack in the background to catch it. The sword lands on top of the stack of hay to the left of the screen and bounces out of sight; Annie then catches another sword that falls from above, that someone obviously dropped for her to catch.

Continuity: When Annie got hit by the huge water balloon, she got herself drenched from head to toe. But in the next scene when both the camp leaders, as well as Hallie, were inside the bunk with her, Annie was completely dry.

Continuity: When Annie and Hallie are dragging Meredith's airbed into the lake, a close-up of the girls at the water's edge shows the one in a blue plaid shirt with her sleeves rolled up. In a long shot behind them, her sleeves aren't rolled up.

Factual error: At the hotel, Chessy's door to her room stays open after she goes into the other room to discuss the whole 'dad doesn't know' matter. In real hotels, the guest-room doors have auto-closing mechanisms for fire safety and security. The door would have swung closed and locked Chessy out, but even though this is a 4 or 5 star hotel which would be fully equipped as far as modernity's, it doesn't.

Continuity: When Annie and Hallie get out of the water bin after their fence match, the water stain on Hallie's vest changes patterns.

Continuity: After Annie first meets Meredith (playing Hallie), when she's sitting in the red water floater, her necklace goes from tucked inside her bathing suit to out, then to in again.

Factual error: After Hallie and Annie send Meredith out on the air mattress onto the lake, Meredith wakes up and there is a bird on her chest. The bird is a Red-Crested Turaco, which are native to Africa.

Continuity: During the scene when Hallie and Annie are seen lying next to each other, Annie's ponytail goes from in front of her to in back in some shots.

Continuity: When Hallie (posing as Annie) arrives in London, she is seen sitting on the left seat in the car when she's on her way home, passing by the various spots in London. However, when she reaches home, she is sitting on the right side of the car. Unless she was sitting alone, this is not logical as Martin was sitting together with her at the back of the car.

Audio problem: In the scene where Annie is saying goodbye to her butler Martin and they perform their legendary handshake Annie is the first to put her hand down when they stack there hands, however you hear a clapping sound. I saw this on video and I know the movie inside out. This was no cinema mistake.

Factual error: Copyright stamp at the end of credits reads MCMMXCVIII, that is the third M is superfluous. [Watched on Australian TV. Wouldn't complain if it wasn't a Disney production ;-) AVB, Sydney]

Revealing: At one point when the two twins are sitting against the wall inside the Isolation Cabin and talking, one of them casts a shadow on the wall while the other doesn't.