When Lord Henry Dashwood (Colin Firth) calls Libby Reynolds (Kelly Preston) to tell her Daphne Reynolds (Amanda Bynes) has been out all day with a boy in a band (Ian Wallace (Oliver James)), Libby says, "Lemme guess, he's a drummer?" In reality, Oliver James, who played Ian, is a drummer. This could also be a reference to The Reluctant Debutante (1958), on which this movie was based. The character on whom Ian was based, David Parkson (John Saxon), is a drummer.
The youth hostel where Daphne Reynolds (Amanda Bynes) initially stays when she has arrived in London is the same building in which Bridget Jones' flat is in Bridget Jones' Diary (2001).
This movie opened during war with Iraq which made Warner Brothers change the poster art for this movie. Because the original artwork showed Amanda Bynes displaying a peace symbol, the artwork was changed so that the peace symbol was airbrushed out. The studio did not want anyone to think the artwork was a war protest.
The scene where Lady Jocelyn Dashwood (Dame Eileen Atkins) is presenting Daphne Reynolds (Amanda Bynes) with a tiara for her coming out party was filmed after principal photography had ended. Bynes was in the U.S. and had already dyed her hair a dark brown, and Atkins was in London.
When Lord Henry Dashwood (Colin Firth) is looking through the photo album of Daphne Reynolds' (Amanda Bynes') childhood, there are actual pictures of Bynes when she was younger.
Anna Chancellor and Christina Cole, who played mother and daughter in this movie, played Caroline Bingley. Anna in Pride and Prejudice (1995) with Colin Firth (who is also in this movie) and Christina in Lost in Austen (2008).
Amanda Bynes said in the commentary that it took three weeks to put braces on her for the short scene of Daphne's fifteenth birthday, in which case, the braces aren't even noticeable.
This movie was based on the 1955 play "The Reluctant Debutante" by William Douglas-Home and the movie The Reluctant Debutante (1958).
Due to insurance reasons, Amanda Bynes and Oliver James weren't allowed to fall out of the boat. They had to get stunt doubles to do it.
West Wycombe Park, the home of Henry Dashwood (Colin Firth), was also the country home of Colin Firth's character in The Importance of Being Earnest (2002).
Aside from shooting in London, they also filmed in Morocco and New York City. When Lord Henry Dashwood withdrew his candidacy, he made that speech at the Old Royal Naval College where Cinderella (2015) and Sherlock Holmes (2009) were also filmed.
The title of this movie is a reference to a Christina Aguilera song of the same title, although the song was not included on this movie's soundtrack.
The Reynolds' house in England was also used for Gosford Park (2001) and The Importance of Being Earnest (2002).
In the plot, Henry Dashwood disclaims his peerage (noble title) in order to advance his political career. The film is based on a play by William Douglas-Home, whose older brother Alec Douglas-Home disclaimed his peerage in 1963 in order to advance his political career; when Alec Douglas-Home became prime minister of the United Kingdom, it was no longer considered acceptable for a prime minister to be a member of the House of Lords rather than the House of Commons. However, disclaiming a peerage was not a plot point in the original play, since the play was first produced in 1955 and peerages could not be disclaimed until 1963.
The film's cast includes one Oscar winner, Colin Firth, and one Oscar nominee, Jonathan Pryce.