Continuity mistake: When Bing Crosby and Danny Kaye enter the club car on the train when heading to Vermont, Bing Crosby puts his suitcase on the floor next to the booth in which they are seating. In fact, Bing places his hat on the bag. The ladies enter the car, join them for a talk (and a song) but when the group gets up to leave the bag is missing.
Other mistake: In the Christmas party scene all the soldiers are in uniform wearing military boots. Except Bing Crosby, who is in his uniform wearing brown dress shoes, in a war zone. (00:03:00)
Continuity mistake: During the Choreography number, Danny Kaye's hands/positions keeps changing during the beginning part.
Answer: The actors appear similar but they are different people. John Brascia danced with Vera Ellen in Vermont. George Chakiris danced with Rosemary Clooney in New York.