Julie Andrews performs her own stunt in the mattress-surfing scene.

The song, "Your Crowning Glory", was the first time Julie Andrews had sung in public, or on-screen since she had throat surgery in 1997. She reportedly nailed the song on the first take, and brought tears to the eyes of the crew present.

Anne Hathaway's mother, Kate McCauley Hathaway, appears in the movie as the Choir Director.

The Disneyland Hotel has transformed a bedroom of the Presidential Suite into a re-creation of Princess Mia's suite from the movie. The room includes set pieces from the movie.

In the beginning scenes, when Princess Mia is explaining what has gone on since the first movie, she says that she and Michael have broken up, and he is now touring with his band. Robert Schwartzman declined to do the sequel in order to focus on his band, Rooney, which was touring the country at the time the movie was being made.

Julie Andrews's line, "I've done a lot of flying in my time," is a reference to her most iconic role with Disney, Mary Poppins (1964).

Julie Andrews loves fresh flowers, and convinced Garry Marshall to use only real flowers in the arrangements inside Rinaldi Castle. During the filming, she was constantly adjusting the arrangements, removing dying blossoms, et cetera. The centerpiece of the kitchen table (in the scene where Nicholas tops his chocolate mousse) got switched from a large piece (as seen in the background) to the cluster of small flowers seen in the final cut, the original arrangement got in the way of the filming.

Reportedly, when Raven-Symoné was told she would sing a song with Julie Andrews for the movie, she was so moved, she started crying.

At the royal garden party, Princess Mia asks a guest how her three grandchildren, Lily, Charlotte, and Sam are doing. Those are the names of Director Garry Marshall's three grandchildren. The guest was Garry Marshall's wife, Barbara Marshall.

The jewelry used by Mia and the Queen is all real. A guard was on-set the whole time. The most expensive piece is the necklace the Queen is wearing at the wedding.

Chris Pine's first major movie debut.

Hannah Schneider, who played "Dancing Princess Hannah" in the slumber party sequence, is Julie Andrews' granddaughter.

In the beginning of the movie, Anne Hathaway accidentally flings her bracelet, which is caught by a palace guard, and he says "It happens all the time." This is the same line, spoken by the same actor, who catches Julia Roberts' character's escargot in Pretty Woman (1990).

Brother and sister Spencer Breslin and Abigail Breslin have roles in this film. Spencer as Prince Jacques, and Abigail as the orphan girl Carolina from the parade.

Between the releases of The Princess Diaries and The Princess Diaries 2: Royal Engagement, Heather Matarazzo (who plays Lilly Moscovitz) revealed that she is gay, or, colloquially, "came out of the closet." In Lilly's first appearance in Princess Diaries 2 she emerges from Mia's closet.

The member of Parliament trapped between the two arguing brothers at the meeting concerning the orphans' home is singer and songwriter Paul Williams. His character's name is Lord Harmony.

At one point, Joe (Hector Elizondo) warns Viscount Mabrey (John Rhys-Davies) to leave Clarisse (Julie Andrews) alone, noting that he has "diplomatic immunity in forty-six countries, including Puerto Rico." Hector Elizondo was born in New York City, but his parents emigrated from Puerto Rico.

In March 2016, Garry Marshall announced that Hathaway, who was pregnant with her first child, would appear in a third Princess Diaries film after she gave birth. Unfortunately, with Marshall's death in July 2016, the project has been postponed.

Lord Crawley and his identical twin brother (who don't get along) tersely acknowledge each other by their first names, Jerry and Dean. This is a reference to Dean Martin and Jerry Lewis, who were the most successful comedy team of the 1950s, yet were known to have had several heated arguments late in their joint career. They finally split up amidst a great deal of bitterness in 1956, and didn't speak to each other for twenty years.

Julie Andrews stated in 2012, that a Princess Diaries 3 didn't happen due to this film being a failure (despite the fact that it made 95 million dollars domestically, and 134 million dollars worldwide, on a budget of 40 million dollars), and that Anne Hathaway was too old to reprise her role.

At one point, Mia refers to Nicholas as Prince Charming. Chris Pine would go on to play Prince Charming in Into the Woods (2014).

The song sung by the opera singer is from "La Traviata." This is the same opera featured in the film Pretty Woman (1990).

Despite the death of director Garry Marshall in 2016, rumors still circulate regarding a third movie. Hector Elizondo, Julie Andrews, and Anne Hathaway have all said that they would return for a third film if the story did justice to Marshall and the first two films.

Sophia Loren is in the birthday party scene, when Raven-Symoné taps Anne Hathaway on the back while the latter is sampling the cake frosting. Seen right between and behind the two, wearing glasses and gold dress.

During the royal garden party, a singer sings "Miracles Happen" (the finale song from the first movie) in Mandarin.

At the end of the movie, when the band is playing, Garry Marshall is playing the bass drum on the left.

The scene shown in trailers, in which Princess Mia says, "Grandma said shut up, shut up!" was cut from the final film.

In the garden, when Mia is practicing her archery, Nicholas enters whistling. The piece he is whistling is the main theme from the third movement of Rachmaninoff's Piano Concerto No. 2.

Julie Andrews and John Rhys-Davies appeared in Victor/Victoria (1982). This is their second movie together.

Queen Clarisse tells Mia, "Nepotism should be in the arts, not in plumbing." Director Garry Marshall involved many of his family members in this movie, including his wife, Barbara Marshall (Lady Jerome), their children, Kathleen, Scott, and Lori Marshall (Charlotte Kutaway, Security Guard Shades, and Teacher Seacliff), their grandchildren Sam Marshall and Charlotte and Lily MarshallFricker (the CherubCheeked Ring Bearer, Princess Grace, and Princess Camille), and their niece, Tracy Reiner (Lady Anthony).

In an article published in Variety in 2015 to mark the ten-year anniversary of the release of Brokeback Mountain, director Ang Lee said that he was unfamiliar with Anne Hathaway before her audition, and he was told by the casting director that "the next actress coming in to read was going to apologize for her clothes and make-up, but to just let her do that, and go into the reading." This was because Hathaway was auditioning for Brokeback Mountain during her lunch break from filming The Princess Diaries 2: Royal Engagement (2004) (also on the Universal lot), and, according to Lee, she read for the part of Lureen "wearing heavy make-up and dressed as a princess."

When Nicholas is throwing pebbles at Mia's window, he is whistling the famous "Flower Duet" from Delibes's opera "Lakme".

DIRECTOR CAMEO (Garry Marshall): Middle drummer in the coronation scene.

Elizabeth Gudenrath (as Beth Anne Garrison) is seen as Princess Mia's Princeton friend, Anna, in Princess Diaries 2: Royal Engagement (2004) and previously portrayed Anna of Plötzlich Prinzessin! (2001) cheerleaders Lana, Anna, and Fontana.

In the Genovian Independence Day parade, the announcer introduces the Mertz marching band directed by Lucille Carmichael. These are names from I Love Lucy (1951), which Princess Mia later confesses to Chris Pine's character is a favorite of hers.

Security guard Lionel, played by Erik Bragg, was also featured in Plötzlich Prinzessin! (2001) as Bobby Bad (teen on cell phone during final softball scene).

In the parade sequence with the orphans, in the top right corner, the marquee of the Genovian National Theatre indicates a production of "Wrong Turn at Lungfish" is being staged. This play was co-written by Garry Marshall and Lowell Ganz. This was also the play in which Kathleen Marshall made her off-Broadway debut in New York City.

In the scene where Mia's evening out is revealed on TV, Lilly is wearing a Berkeley t-shirt. Chris Pine graduated from the University of California, Berkeley.

At the announcement of the royal engagement, Anne Hathaway does a rolling wave to the crowd just like one of the previous popes.

Stars Anne Hathaway and Chris Pine both appear in DC Universe films: she as Catwoman in The Dark Knight Rises and he as Steve Trevor in Wonder Woman.

In the first movie at the annual ball the couple looking at the statue mia earlier shoved a finger into says "they're famous for their cheese, maybe it's string cheese" and in the second movie at the birthday party a guest is heard saying "i hope they have string cheese" making a reference to the first movie

It was based on the book series "The Princess Diaries", written by Meg Cabot.

Several of the automobiles are not familiar to American viewers. In the beginning of the movie, the limousine is a 1972 Mercedes-Benz model 600. The two Police escort vehicles are Nissan Hyperminis. In the same town square, is a 1956 Fiat 600 Multipla and a 1962 Autobianchini Bianchina (Bee-an-cheena). Another Mercedes-Benz 600 is seen at the twenty-first birthday party. A 1966 Mustang convertible shows up later. There is a GEM eL, by Gemcar, maker of utility vehicles for off road use, such as golf courses, et cetera. The Viscount's chauffeur driven 1952 Rolls-Royce Silver Wraith, and finally the non-four-wheel vehicles, which the three interestingly are all Piaggio's. A three-wheeled Ape (Ah-pay) P501, plus two scooters, a Vespa 125 PX, and a Vespa ET4 125. This list of cars is from The IMCDB (Internet Movie Cars Data Base) imcdb.org/movie_368933-The-Princess-Diaries-2--Royal-Engagement.

Stan Lee: The wedding attendee who acts like one of the Three Stooges.