Corrected entry: When Hugh Grant enters The Ritz from the street outside he walks to the lift with the Time Out journalist behind him. The green, digital number on the wall indicates that the lift is on level 5. It is not possible that they walked into The Ritz on level 5, not the ground floor, and then tried to travel up to the third floor, as the journalist requests. (00:22:45)
Corrected entry: At one point, driving down Haymarket, they turn left into a side street to take a shortcut round Trafalgar Square. The next scene shows the Rhys Ifans character stopping the traffic next to Admiralty Arch to let the car come out of a side street. However, to get to the street out of which they are shown as emerging, the car would have had to drive all the way round Trafalgar Square and turn left off Cockspur Street, almost back where they started. The street they turned into off Haymarket comes out on Pall Mall East and the only way to go is along the north side of Trafalgar Square. So unless there's a wormhole between the two streets, the shortcut was anything but.
Corrected entry: In the scene when Anna first walks into the shop, her hair is really long and goes about half way down her back. When she goes to the flat, and throughout most of the rest of the film, her hair is shoulder length. There is another instance when she once again has really long hair, when she is eating in the restaurant with Will.
Corrected entry: During the scene where Hugh Grant is walking through Notting Hill as the seasons change, you can see his sister by a flower cart having a fight with her boyfriend. She has short, red hair. In the next scene, she walks into his shop and says "I got her phone number." She now has longer blond hair. In the very next scene, that night, she again has short red hair.