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Press materials contained in the copyright file on the film credit Hans Weeren with sound, however, the film only gives the sound credit to Hal Bumbaugh, who is listed as the sound engineer. Weeren was the head of the Fine Arts sound department according to Film Daily Year Book and other sources, which May account for the discrepancy. Actor Tenen Holtz's first name is spelled "Tennen" in the onscreen credits. A sequel to Cipher Bureau, entitled Panama Patrol, was made early in 1939 by Fine Arts and was also directed by Charles Lamont, with stars Leon Ames and Charlotte Winters reprising their roles from the first film (see below).