Continuity mistake: When William takes Anna back to his flat, after the orange juice incident. His shirt is stained, she comes into the flat and changes. Then she leaves. When she returns to get her books, his shirt is still stained but after she kisses him the stain is gone. An impressive kiss... (00:16:45)
Revealing mistake: In the scene where they are all having a farewell dinner at Tony's restaurant. At the end of the meal they are all scattered around the restaurant, the camera is on Bella and Honey and in the background, outside the restaurant, 4 extras walk past, 3 at the front and one behind. The next shot is at the window where Max and William are sat, again the 4 extras walk past in exactly the same order and positions. They are the same people because one of them has a pink top on and you see that twice.
Continuity mistake: At the bookstore, in the wide shots the surveillance monitor is sitting in the center of four large books, yet in the close-up of the monitor, showing Rufus, the shoplifter, there is another book lying on the larger books, to the left of the monitor. (00:06:15 - 00:07:05)Super Grover
Continuity mistake: After William leaves the movie set, in the next shot he goes back to the book shop. Seen through the window is the table with the books and globes. Then when Anna is standing near the window, we see that there are completely different kinds of books on the top shelf now. (01:39:10)Super Grover
Revealing mistake: In the scene where Will and his friends are driving to catch Anna at the press conference, Spike jumps out of the back of the car to halt traffic and let their car through. When he closes the back door, the sound effect of a slamming door is loud, but the door doesn't shut - you can see it bounce back up.
Continuity mistake: In the 3-shot sequence where Honey is opening her birthday gifts, the shots show the following: 1. Hugh Grant puts a necklace on Honey and she is wearing the hat; 2. She has just opened the hat and is not wearing the necklace; and 3. She is wearing the hat and no necklace. In the following sequence (the competition for the brownie), she is wearing the necklace and no hat. (00:38:00)