Deliberate mistake: After the hotel murder, Brophy makes a series of photographic enlargements to prove Dr. Thorndyke's innocence. However, instead of holding his magnifying glass directly in front of his face as he examines the photos, Brophy angles the magnifying glass far to his right so the movie audience can see the magnifying glass details, but he can't possibly see anything.
Dr. Richard H. Thorndyke: Professor Little Old Man.
Dr. Vicktor Lillolman: "Lillolman." "Lillolman."
Trivia: When Dr. Thorndyke is checking into the hotel in San Francisco, he is informed a "Mr. MacGuffin" has changed his room number. "MacGuffin" is a movie-making term popularized by Alfred Hitchcock referring to a plot device that drives the story, but what the object actually is or does is irrelevant.
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