Filming ended in November 1962, only two days before production began on Audrey Hepburn's next film, Charade (1963), which also was set in Paris.
Filmed in 1962 but not released until 1964.
The Dracula sequence was the last one completed for the film. It had to be shortened because William Holden smashed his new Ferrari into a wall and wound up in a splint.
At the time he signed for this film, William Holden was still carrying a torch for Audrey Hepburn, with whom he became seriously enamored when they co-starred in Sabrina (1954). Hepburn accepted this role in hopes that her influence might help Holden stop the serious career slump in which he found himself. Despite his feelings for Hepburn, Holden at this point was a serious alcoholic and continued his drinking throughout the production, inflating both the film's production schedule and budget.
According to Audrey Hepburn's son Sean Hepburn Ferrer's memoir, this was her least favorite of the films she made during her years as a star, despite the fact that she called it "a joy to make". Ferrer wrote that it taught her a lesson: "Just because the film was easy to make doesn't mean it's going to be very good."
Tony Curtis: as the imaginary actor portraying Maurice or Philippe, the imagined version of Gabrielle's actor friend Philippe in Richard's visualized screenplay, as Gabrielle says Philippe looks like Curtis. Curtis agreed to a guest role in the film as a favor to George Axelrod, because William Holden was forced to enter an alcoholic clinic in the middle of filming.
Frank Sinatra: (voice only) singing the title song to Richard's movie as Richard imagines the opening title card and credits.
Marlene Dietrich: as herself, the woman getting out of the white Bentley in Richard's visualized screenplay.