 The home used in the film is not the Rosenbach Museum and Library,  but is a private home two doors west. Both houses, however, were  built at the same time and originally had an identical floor plan.  During the filming of the movie, DeLancey Place was closed for a few  days. Denholm Elliott (qv) was the only actor in the film to visit  the Rosenbach. The staff of the museum were all given Pennsylvania  State Film Commission tee shirts.