Nicole Kidman and Julia Roberts were originally the stars of the film, but the producers decided to shoot the film with a younger cast. Kidman also remained on board as a producer.
The production spent four days filming in Paris and two weeks filming in Monaco. The rest of the filming took place in Hungary, with Budapest doubling for Paris and Monte Carlo. Raleigh Studios Budapest was used to substitute for Monte Carlo's Hotel de Paris for the filming.
The airport stamps in passports of Meg, Grace and Emma are dated June 19, 2010. The stamp in Owen's passport is from June 22, 2010. However, when Owen arrives to Monte Carlo, he shows the issue of the newspapers from June 10, 2010 featuring Emma, Grace and Meg on the front page.
The airport stamps that Emma, Meg, Grace and Owen received upon arrival are country exit stamps. The arrow on the stamp should have been pointing to the right upon arrival into a country, not left.
Emma is watching Grace Kelly in To Catch a Thief in the hotel room in Monte Carlo. When Grace Kelly became the Princess Consort of Monaco all of her films were banned from ever being shown in the country of Monaco, including the capital city Monte Carlo.