Warner Bros. created the advertising marketing ploy "Clue Club" to increase audiences attending its crime mystery/drama movies. Twelve titles showing the Warner Bros. "Clue Club" promo footage were released from 1935 to 1938.
Clue Club #1: The White Cockatoo (1935)
Clue Club #2: While the Patient Slept (1935)
Clue Club #3: The Florentine Dagger (1935)
Clue Club #4: The Case of the Curious Bride (1935)
Clue Club #5: The Case of the Lucky Legs (1935)
Clue Club #6: The Murder of Dr. Harrigan (1936)
Clue Club #7: Murder by an Aristocrat (1936)
Clue Club #8: The Case of the Velvet Claws (1936)
Clue Club #9: The Case of the Black Cat (1936)
Clue Club #10: The Case of the Stuttering Bishop (1937)
Clue Club #11: The Patient in Room 18 (1938)
Clue Club #12: Mystery House (1938)
Clue Club #1: The White Cockatoo (1935)
Clue Club #2: While the Patient Slept (1935)
Clue Club #3: The Florentine Dagger (1935)
Clue Club #4: The Case of the Curious Bride (1935)
Clue Club #5: The Case of the Lucky Legs (1935)
Clue Club #6: The Murder of Dr. Harrigan (1936)
Clue Club #7: Murder by an Aristocrat (1936)
Clue Club #8: The Case of the Velvet Claws (1936)
Clue Club #9: The Case of the Black Cat (1936)
Clue Club #10: The Case of the Stuttering Bishop (1937)
Clue Club #11: The Patient in Room 18 (1938)
Clue Club #12: Mystery House (1938)
Ann Sheridan plays the same character in The Patient in Room 18 (1938) and Aline MacMahon plays her in While the Patient Slept (1935) - and there are others. All of these are based on novels by Mignon G. Eberhart.
John Harron was in studio records/casting call lists playing "Director", but he was not seen in the movie.