 Originally "White Palace" was to have been "White Castle", and in  the novel specific reference is made to a real White Castle location  at the intersection of S. Grand Blvd. and Gravois Ave. in south St.  Louis, Mo., but the White Castle chain wouldnt give permission for  their trademarked name to be used in either the novel or the movie,  or allow the use of any of their restaurants for film locations. The  diner used for the films "White Palace" restaurant tried to change  its name to White Palace after the film was released, but the studio  refused permission, so it was renamed "White Knight" by its owners  instead. It still exists and is open for business.