Walk on the Wild Side is, like the 1976 US/USSR collaboration that resulted in the dreadful musical mistake that was The Bluebird, a film whose backstory is infinitely more interesting than the motion picture released. Conflict-of-interest deals were behind much of Walk on the Wild Side's grab-bag casting (Laurence Harvey was being pushed by the wife of the head of Columbia Studios, while Capucine was being promoted by producer Charles K. Feldman).
The film was plagued by constant rewrites, deleted scenes (the internet is full of rumors regarding a curiously missing-in-action hairbrush spanking scene between Stanwyck and Capucine ... be still my heart), costly delays, and a cast that was often openly antagonistic to one another as well as to the director.