Was filmed on-location at the site of the New York World's Fair, with LaGuardia Airport being so close, it caused trouble with filming because of noise from the planes.
Also a reunion for Ray Bolger and Margaret Hamilton, who played The Scarecrow and the Wicked Witch of the West respectively in "The Wizard of Oz".
A reunion for Paul O'Keefe and Patty Duke, who played brother and sister on all three seasons of "The Patty Duke Show."
Because Rankin-Bass feature films were geared toward children, they were all shot in a 1.33:1 aspect ratio with superfluous picture information on the top and bottom of each cell so that the finished product could be matted for 1.85:1 widescreen projection in theaters while retaining a 'squared' negative ratio for perpetual television viewing. To view Rankin-Bass films in their intended 1.85:1 aspect ratio, use the Zoom 1 feature on 16:9 televisions.
The caricatures of the cast that appear at the beginning of the movie are by Al Hirschfeld, whose work is uncredited here.