Trivia: Bob Wallace's theories about what dreams are caused by which types of foods were almost entirely improvised.
Trivia: In the scene where Bing Crosby and Danny Kaye are escaping the club where the sisters are performing, you see Bing Crosby hail a cab. Notwithstanding that there happens to be a cab in the alley, but moreover, when Bing "whistles" you can hear that he wasn't able to do it. It comes out as a "flub" sound. Not really a mistake, but kinda funny.