Revealing mistake: When the driver is taking Amanda to the airport at the end, all the dials on the car are at zero, so obviously the car is not moving at all.
Other mistake: When Amanda's driver brings her to the cottage for the first time, he tells her he can't drive her up there because he would not be able to turn around, but the same driver picks her up at the cottage when she is leaving and presumably has no issue turning around at all, and you can see it's a flat field in front of the cottage.
Character mistake: Arthur (who knew him) says that Cary Grant was from Surrey and Iris (who is from Surrey) agrees with him. Cary Grant was actually from Bristol.
Continuity mistake: When Cameron Diaz and Jude Law are in bed for the last time, her bra strap changes from being up and hanging down whenever the camera changes.
Factual error: When Iris is unable to sleep she looks over at Amanda's bedside clock which displays 5:00 pm, however, moments later Iris discovers a button to lower the shade. There is bright sunlight coming into the room, however, in December the sun sets prior to this time (about 4:45pm according to timeanddate.com)
Continuity mistake: When Cameron Diaz is singing and dancing in the first shot she is holding a wine glass. In the second shot, when the camera pulls back, the glass is sitting up by the bottle. There was no break in the sound. (00:33:55)
Character mistake: In the last scene Iris hugs Olivia, saying, "Sophie, give us a kiss". (02:03:20)
Continuity mistake: At the end of the film when Cameron Diaz decides to leave the Mercedes and walk back to the cottage, in every shot of the lane leading back toward the cottage, the tyre tracks appear and disappear with each shot.
Continuity mistake: During the dinner with Jack Black, Kate Winslet, and the old guys, the candles on the table are sometimes burned right down, and sometimes have an inch or so remaining, going up and down between shots.
Continuity mistake: When Iris first arrives at Amanda's house and is rushing from room to room, her scarf is wrapped around her neck and tied, then untied, then tied. Also, when she gets out of the taxi, she is not holding a notebook. Yet, when she enters the front door, she is holding a notebook.
Continuity mistake: The morning after Amanda and Graham first spend the night together, as Graham is preparing to depart, he pulls a sports coat over his shirt. Initially he pulls the shirt collar over the coat, in the next shot the collar is under the coat, and in the next the collar is out again.
Continuity mistake: At the beginning of the movie, When Kate Winslet's character is talking to a friend who works in the Daily Telegraph office, this friend's cigarette changes length with different shots.
Factual error: When Amanda arrives in England, on the way to the cottage and at the cottage, there is snow everywhere: road, yard, field, trees. he next morning, she says it is "freezing cold" but the snow is gone and all the field is green as if it would be spring over the night.
Factual error: In the scene where Iris has landed in California and traveling to the home, she is headed the wrong way on the Pacific Coast Highway. She was headed SOUTH on PCH where there is no airport north of her to bring her to California on an international flight.had to be coming into LAX.
Continuity mistake: When Cameron Diaz is throwing shoes at Edward Burns at the beginning of the movie, the shoes she has thrown are on the landing in one shot and then disappear in the next.
Other mistake: The wrong flag for Poland is shown when Amanda s going through the exchange countries at the beginning of the movie.
Factual error: The outside view of Kate Winslet's 'cottage' is not a cottage at all - in England it would be considered a large detached house and it has several rooms on the upper floor. However, the inside depicts an actual cottage: there is only one bedroom (Jude Law has to sleep on the sofa), the bathroom is too small for a regular sized bath, and the downstairs only has a couple of rooms. So the outside view of the house is large, while the interior is depicted as tiny.
Continuity mistake: In the scene where Amanda has come downstairs after "never having that much to drink", her leggings are pink. Then it shoots to Graham, and back to Amanda, and her leggings are suddenly a dark brown. This definitely wasn't a trick of the light.
Other mistake: In the beginning scene when Amanda throws the first shoe at him it ends up behind him in the middle of the hallway. When she throws the second shoe at him it ends up at the top of the stairs where all of a sudden the first shoe is. When he enters the room there are no shoes at all. They even walk down the stairs without picking up his shoes.
Continuity mistake: When Amanda drives into town, one shot shows her running her left hand through her hair and the next angle shows her right hand.
Answer: I'm not sure how much she was paid, but no, it isn't a real movie.