In the scene where Gilda is brought back to Argentina by Tom, she slaps Johnny hard across both sides of his face. In reality, Rita Hayworth's smacks broke two of 'Glenn Ford''s teeth. He held his place until the take was finished.
The photo of Johnny Farrell as a baby is a picture of 'Glenn Ford''s real-life son, Peter Ford.
Rita Hayworth had to wear a corset while shooting "Put the Blame on Mame," as she gave birth to her first daughter, Rebecca, months before filming.
The movie's poster was as #6 of "The 25 Best Movie Posters Ever" by Premiere.
In the scene when Germany surrenders, the crowd in the Casino is singing the 'Marcha de San Lorenzo' (San Lorenzo's March), instead of the Argentine national anthem (which would have been the logical theme to sing at that occasion). This piece of music honors a famous battle in Argentine history, and is usually played only in the festivities related to Argentine hero José de San Martín.
There is a rumor that this film is the only time you hear Rita Hayworth's real singing voice but it is sadly not true. The truth is that Rita never recorded her own singing voice and was a talented lip-syncer