Although Neil Sedaka is credited on-screen for being "heard through the courtesy of Polydor International/Rocket Records," he is not mentioned in the soundtrack listing or anywhere else in the print. This is because his song, "Yes Sir! That's My Baby" is incorrectly credited to Michael Chain
According to Bruce Dern, who talked about the movie on The Projection Booth podcast in 2016, there were suppose to be 2500 extras in the film for the pageant scenes. Since it was really important that the same faces show up in the audience in every scene for consistency, the filmmakers came up with an idea to give away five Cadillacs each day of the three-day pageant shoot to five lucky extras. Each extra would get a ticket in the morning and by the end of the day they'd get to enter the Cadillac lottery. This not only made sure that the same people would return each day, but 7000 additional people showed up to play extras and try to win the cars. Since they didn't need that many extras, the filmmakers decided to charge the extras 25 dollars to let them be in the movie and play the Cadillac lottery. Dern concludes the anecdote by amusingly stating that this was the only time in his career that he saw a movie making money directly off the people who worked for the movie.
In 1986, "Smile" was turned into a short lived Broadway musical. The show had music by Marvin Hamlisch, and book and lyrics by Howard Ashman, who also directed. The musical featured Jodi Benson, who later provided the voice of Ariel, the title character in Disney's "The Little Mermaid", for which Ashman also wrote the lyrics.
According to Annette O'Toole, who gave an interview about the movie for the Projection Booth podcast in 2016, there were only eight professional actresses among the beauty contestants. The rest of the girls were either extras or actual professional beauty contestants.
the film's distribution company United Artists only had four of their own theaters in the US and it was decided that that the movie will play only there and that they won't spend much on advertising the movie since it was projected that the movie won't bring back any money either way. The movie's director Michael Ritchie, who loved the project, tried to promote the movie himself because of this by traveling to the cities where the United Artists theaters were located with a few girls from the cast to do on the spot promotions. Unfortunately, this didn't help the movie much and it still made little business.
Since Paul Benedict and Joy Carlin are credited in the opening set of credits, but are not in the more comprehensive end credits, the opening credits are listed first, followed by those in the end credits not yet in, as required by IMDb policy on cast ordering.