During the song "How Long Has This Been Going On?", a crew member can be accidentally spotted moving around reflected in the mirror behind Audrey Hepburn. 

To secure both Audrey Hepburn and Fred Astaire for the lead roles, the producers told each actor that the other had already signed on, ensuring neither would turn down the project. 

Unlike many movie musicals of the era where actors were dubbed by professional singers, both Hepburn and Astaire performed all of their own vocals for the soundtrack.

Though it shares a title and its male star with the 1927 Broadway musical Funny Face, the film uses an entirely different plot and features only four of the original stage songs.