Trivia / Sherlock Holmes in New York

• California Doubling: Despite the film's title, the production was shot entirely in Southern California at the 20th Century Fox lot in West Los Angeles, with some scenes filmed in Santa Monica.
• Cameo Prop: Professor Moriarty has The Maltese Falcon sitting on his desk.
• Cast the Runner-Up: Gig Young was originally cast as Inspector Lafferty, the part ultimately played by David Huddleston, but was switched to the part of banker Mortimer McGrew.
• What Could Have Been: In his memoirs, Roger Moore mentions that he called up Oliver Reed and offered him the role of Moriarty. Reed turned the role down, because many years earlier Moore had made a critical remark concerning Reed's acting ability.

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