Richard Rodgers reportedly disliked every aspect of this film except for the casting of Janet Leigh as his wife.
Singing "I Wish I Were In Love Again" was the last time Judy Garland and Mickey Rooney appeared on screen together.
Judy Garland's two songs "I Wish I Were in Love Again" and "Johnny One Note" are sung at the same party, but they were filmed four months apart from each other. You can tell based on her longer hair in the second number and the thicker, belt-less waistline (from a slight weight gain) in the dress she is wearing.
Judy Garland was paid more for her cameo appearance than for all of her work on The Wizard of Oz (1939)
Judy Garland was scheduled only to sing with Mickey Rooney in this film, and producer Arthur Freed offered her $50,000 (or half of what she owed the studio for medical bills) to do one take. At the first public screening, the fans asked for more of her, so Freed offered her another $50,000 to do a second song. By the time her scenes were filmed, she had paid back the studio but had made nothing.