In her 1991 autobiography, "Ginger: My Story," Miss Rogers related that the entire film originally was planned for Technicolor. However, other sources, including Arlene Croce's "The Fred Astaire & Ginger Rogers Book," a lauded study published in 1972, maintained that just one Irving Berlin song, "I Used to Be Color Blind," would have burst into Technicolor during the dance. Miss Croce explained that color tests were shot, but their quality was poor, so the scheme was dropped.
Fred Astaire refused to sing the Irving Berlin song "The Yam" because he thought it was silly, so Ginger Rogers got a rare chance to sing it alone. Later Fred joined in the dance after Ginger was finished singing.