Astaire's "Puttin' on the Ritz" number, where he dances to eight images of himself, is one of the great highlights. First introduced by Harry Richman for the 1930 musical, PUTTIN' ON THE RITZ, the original lyrics have been changed to fit the Astaire style as well as the changing of times. Crosby and Astaire also provide fine moments with their joint collaboration as "A Couple of Song and Dance Men." Billy De Wolfe supplies much of the comedy relief as Johnny's partner and assistant. Aside from being the love interest to Olga San Juan, he does a five minute one man comedy routine as Mrs. Murgatroyd.
While the story tends to get corny at times, it does get better with its passage of time and its assortment of fine songs. Aside from Crosby's singing, his sentimental moment where he meets with his little girl (Grimes) again is well done, along with Astaire's dancing, which is always first rate. He briefly breaks away from his traditional character where he becomes a troubled dancer who turns to liquor after being jilted. Joan Caulfield, then new to the movies, would work again with Crosby in WELCOME STRANGER (1947), an underrated drama with songs. Crosby and Astaire wouldn't work together again (except for a radio show together in 1951) until being reunited again for their TV special, "A Couple of Song and Dance Men" (CBS, 1975). Also in 1975, the two would make an great album together of the same name that I recommend.