The original Broadway musical opened May 9, 1982 at the 46th Street Theater and ran for 729 performances with Raul Julia as Guido. It won five Tony awards, including Best Musical and Best Featured Actress. The latest Broadway production, starring Antonio Banderas as Guido, opened on Apr 10, 2003 at the Eugene O'Neill Theatre and ran for 283 performances. It won two Tonys: Best Revival of a Musical and Best Featured Actress. Banderas turned down the chance to reprise his role as Guido in the film version.
Catherine Zeta-Jones was set to play Claudia but dropped out during negotiations. Jones wanted the role of Claudia enlarged. When Marshall refused, Jones left the project.
George Clooney, Johnny Depp and Antonio Banderas (who took Guido's role in 2003 Broadway revival, and was nominated for a 'Tony Award') were considered as possible Guido.
Javier Bardem turned down the role of Guido, being replaced by Daniel Day-Lewis. Both won acting Oscars the same night: Bardem in the supporting category (for No Country for Old Men (2007)) and Day-Lewis in the leading one (for There Will Be Blood (2007)), as did Day-Lewis's costar, Marion Cotillard (Actress in a Leading Role for La môme (2007)). Catherine Zeta-Jones turned down the role of Claudia, being replaced by Nicole Kidman. Both also won acting Oscars the same night: Zeta-Jones in the supporting category (for Chicago) and Kidman in the leading one (for The Hours).
Only the second movie musical for Sophia Loren, the first being Man of La Mancha (1972), even though she is a capable singer, as can be heard on many novelty and soundtrack recordings.
This is one of four movies released in 2009 which only used the number nine in its title. The other three are 9 (2009/I), $9.99 (2008) and District 9 (2009).