In the film's opening sequence, Cavanaugh and Graham are seen dancing alone together in the middle of a studio. Graham is wearing a dress and red high-heeled shoes. Originally,Graham went barefoot so it would be easier for her to dance, but Cavanaugh was an awkward dancer and kept accidentally stepping on her toes, so she needed to put shoes on to shoot the dance number.
Cavanagh and Graham have both appeared on the US sitcom "Scrubs"--separately, and they never share any scenes.
Graham and Alan Cumming also both appeared in the film "Boogie Woogie"