Trivia

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)

Fans of William Hopper - aka private eye Paul Drake from Perry Mason (1957) - might be slow to recognize Hopper in this early role. He has black hair (instead of blond) and he's 20 years younger than when he appeared in the popular series about the famous lawyer, but his distinct voice is easily recognized.

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.