Although this movie's title was widely understood to say that Bo Derek's looks rated 10 out of 10, the rating actually given to her character's looks in the scene where the subject arises is 11, even 12, out of 10.
George Segal was originally cast in the lead role but walked off the set shortly after filming began. Reportedly, this was rumored because Julie Andrews' role had been built up. Apparently, after this movie had been release, Segal, when once asked if he had seen the movie, allegedly replied with a finger gesture. This makes the first time that George was replaced by Dudley Moore. This would happen again for the title role of Arthur (1981)
Actor Dudley Moore is seen playing the piano in this picture, his character is a composer. In real life, Moore was also a real-life pianist and lover of the piano. On movie sets, Moore would often entertain the crew playing the piano between breaks in filming.
Because of this movie, Ravel's "Bolero" remains one of the most expensive songs to use for film and TV; the rights cost more than $25,000. According to SACEM, the French equivalent of ASCAP, Ravel's estate earns more royalties than any other French composer.
The customized license plate on Sam (Julie Andrews)'s car read 'SAM 1". The dedicated license plate on George Webber (Dudley Moore)'s car read "ASCAP". This acronym stands for the "American Society of Composers, Authors and Publishers". Moore's character in the movie is a composer.
The picture's opening title card dedication states: "This Film is Dedicated With Love and Respect to Dick Crockett". Crockett had been a stunt man and a double for Peter Sellers on a number of Blake Edwards' movies and passed away in 1979 around the time this film was completed. 10 (1979) was Crockett's final film.
George Segal's participation in early filming occurred when the Mexico location was photographed first. When the film company returned to Culver City, for filming at the MGM Studios, production was expected, and planned, to continue. Returning to MGM from Mexico, George Segal learned that Blake Edwards had inserted a 'television musical commercial' segment for Julie Andrews, to sing and dance! The feature's interior sets were under construction, being painted, finished, and dressed on the MGM lot's sound stages. Miriam Nelson was rehearsing the choreographed segment with Julie Andrews and male dancers. Declaring that Blake Edwards was using his film to revive Julie Andrews career by riding on his coat tails, George Segal walked off the film! Blake Edwards immediately hired Dudley Moore, shutting down the production until Moore could start, and filming continued. When viewing the Mexican location segments, George Segal is the actor filmed in those scenes. These segments were never re-shot but used in the final film. The 'television commercial musical' production scene was relocated, and re-staged on location at the Pasadena Civic Theater stage, utilized stage scenery rented from the Dallas Civic Light Opera Association's musical stock sets.
Director Blake Edwards had difficulty finding the right actress to play the pivotal role of bride Jenny, and gave serious consideration to using his own daughter Jennifer Edwards, even filming a screen test of her. Once Bo Derek read for the part late in the process, all consideration of other actresses ended.
First major film appearance of actress Bo Derek in a main role. Bo was cast in the film at the suggestion of then husband John Derek who had been previously married to both Linda Evans and Ursula Andress. Bo was twenty-two years of age when she appeared in this movie having previously had a small part in the movie Orca (1977). Bo had been most well-known at the time for an erotic poster where she was seen at the beach kneeling in the surf which had sold over half a million copies. When Bo auditioned for 10 (1979), Blake Edwards recounted, "Her first words, when she came in to read for us, were: 'I'm sorry about wasting your time...Meanwhile, [co-producer] 'Tony Adams' and I were crossing our fingers and praying: 'Let her be able to act - please let her be able to act!".
The name of the amateur song that George Webber (Dudley Moore) listened to was "I Have an Ear for Love". Director Blake Edwards told composer Henry Mancini to "Write me a lousy song - I mean, a real stinker". Mancini once said, "There's no question about it - it's definitely the worst song I have ever written. In fact, every so often, a nightmarish thought runs through my head . . . What - heaven help us - if 'I Have an Ear for Love' becomes a hit?". Ironically though, the song still got to feature on the "10" movie soundtrack.
To find a "10" for the film, director Blake Edwards originally scouted a variety of locales such as coffee shops, talent agencies, little theaters and model agencies and went to a fashion show where a dozen top models screen-tested underwear of their own choosing. Edwards then decided that spectacular beauty is no substitute for acting talent and that the ability to market products is different to carrying a major acting role in a major motion picture.
The movie has been said to have popularized Maurice Ravel's classical piece of music, "the Boléro". The song is played in the movie while Dudley Moore and Bo Derek are making love. There was a big connection between this music piece and sex symbol Derek, as the first two letters, "BO", formed the beginning of both the music piece's title and Derek's first name. Derek later starred in a movie called Bolero (1984) which further capitalized on this connection. Moreover, that movie was one of two with that title made during the early-mid 1980s, the other was Claude Lelouch's "Bolero: Dance of Life" [See: Bolero (1981)].
The film's "10" title references an attractiveness rating system used by people to rank members of the opposite sex. A '10' is usually the highest score attainable but in the movie Bo Derek was actually rated an "11". The movie popularized the rating system which became a part of common usage and popular culture. Publicity for the actually picture made a movie joke. It was that one man's "10" might be another man's "8½ (1963)"!.
First appearance in a cinema movie in four years for actress Julie Andrews who was married to director Blake Edwards. Andrews' last part had been in as Judith Farrow in Edwards' The Tamarind Seed (1974). The DVD sleeve notes for this film state that for this picture Andrews "returned to movies after a long absence".
Sam J. Jones played David Hanley, husband of Jenny Hanley. Ironically, Jones's next role was Bo Carlson in the tele-movie Stunts Unlimited (1980). Jones played a character in his next film who had the same first name as his co-star in this movie.