southern and gail gerber moved to london in early 1966, when southern was hired to work on the screenplay of "casino royale". the episodic "quasi-psychedelic burlesque" proved to be a chaotic production, stitched together from segments variously directed or co-directed by a team that included joseph mcgrath, robert parrish, val guest, john huston, richard talmadge, and ken hughes. many planned scenes could not be filmed due to the feud between orson welles and star peter sellers, which climaxed with sellers walking out during the filming of the casino scenes and refusing to return. many writers contributed to the screenplay, including southern (who wrote most of the dialogue for sellers), woody allen, wolf mankowitz, michael sayers, frank buxton, joseph heller, ben hecht, mickey rose, and billy wilder.