Trivia: The "Sisters" comedy act was completely improvised by Bing Crosby and Danny Kaye.
Trivia: Vera-Ellen was a great dancer and decent actress. She couldn't sing well enough for the movie, though. All of her singing parts are dubbed. Her part in the Sisters song was actually Rosemary Clooney who sang both parts. For all the other songs it was Trudy Stevens. The only time Vera Ellen's voice is heard is when they got off the train, they all sing the first verse from the song Snow.
Trivia: The song "White Christmas" originally appeared in the 1942 movie "Holiday Inn," starring Bing Crosby alongside Fred Astaire, although the song is usually referenced back to this movie.
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.
Suggested correction: Regarding the cab, it didn't just show up. When Danny Kaye is telling Bing Crosby about the girls' predicament with the sheriff, he tells Crosby to get a cab. Being that this is a busy nightclub, there would be cabs hanging around, waiting for fares. There is then a fair amount of time while the sheriff is being stalled and before all four exit out the back of the club to the waiting taxi. Crosby, probably with the friendly club owner's help, had the cab pull around to the back alley.
Trivia: Rosemary Clooney has said she took the role primarily to perform with Bing Crosby.
