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Actor DeForest Kelley's surname is misspelled as "Kelly" in the opening credits. Scenes of the murder of "Edward Clary's" girl friend, and his subsequent arrest are shown without dialogue, in a montage interspersed with opening credits. The death of "Victor Scott" in the last scene, as mentioned in reviews, is not shown explicitly, but is implied. Exteriors of downtown Los Angeles are shown throughout the film.
According to information contained in the file on the film in the Warner Bros. Archive at the University of Southern California Cinema-Television Library, paintings seen in the office of "Frank Garland" were original oil paintings owned by Edward G. Robinson, a well-known art collector. According to Warner Bros. memos, Robinson loaned the studio six paintings, cumulatively valued at over $213,000, for the production. Two of the paintings, Dancers in Repose by Edgar Degas and Tahitian Flowers by Paul Gaugin are shown prominently in scenes set in Garland's office. At one point, Robinson's character, "Victor Scott," comments that he could never afford originals. Two other paintings, which are later shown in Scott's office, included Courtroom in the Country by George Roualt and Beautiful Model by Andr Derain. Warner Bros. memos also stated that two original paintings by actress Gladys Lloyd, who was then married to Robinson, were also used in the film, but their exact placement within the story has not been determined.
Although their appearance in the film has not been determined, Hollywood Reporter production charts add Phil Arnold, Jack Lomas and Jean Anderson to the cast. Warner Bros. memos indicate that actor James Daly was originally considered for the role of reporter "Joe Knight." Illegal marked the motion picture debut of actress Jayne Mansfield (1933-1967). Warner Bros. script material reveals that Mansfield was to appear in a nightclub scene, where she would sing two new songs, but that sequence was not included in the released film. Script information in the Warner Bros. archives indicate that, initially, the victim in the opening scene was to be shot while taking a bubble bath in a sunken tub but MPAA officials objected.
Warner Bros. had made two previous films based on the Frank J. Collins play: the 1940 production, The Man Who Talked Too Much, which was directed by Vincent Sherman and starred George Brent and Virginia Bruce and the 1932 production The Mouthpiece, directed by James Flood and Elliott Nugent, and starring Warren William (see entries below). As noted in reviews for the 1932 film, the main character was inspired by real-life lawyer William J. Fallon.