In the scene in the classroom, miniature flags of several nations are sitting on the desk. The Canadian flag, however, is inaccurate because the Red Maple Leaf flag used was only created in the 1960s and became Canada's official flag in 1965 many years after "Pennies from Heaven" took place.
Christopher Walken's bar-top dance scene took two months of rehearsal and two days of shooting. He claims he got compliments later from fans Fred Astaire and Gene Kelly.