Continuity mistake: In the scene where Julia Robert's character first goes to Hugh Grant's character's flat, there's a chalkboard that's telling Spike to clean up. It's quite small writing, but in a close-up of Hugh Grant when he's directing her upstairs it's clearly larger. It then goes small again until she comes downstairs, when it goes large and stays that way.
Continuity mistake: Every time they show the outside of the bookstore, on the left you see the same adult drying a child's tears.
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...
Continuity mistake: Despite the passage of time, every time we see the back of the door in the book shop the same post is visible in the basket.
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: When William is interviewing Anna in the hotel suite, behind the lever door handles, there are two wide, brass, open lattice finger plates, which change to narrow, brass, closed lattice finger plates.