Did You Know?

Patricia Collinge, who plays Emma Newton in the film, wrote the garage scene between Charlie (Teresa Wright) and Jack (Macdonald Carey).

"Shadow of a Doubt" was the script title but was listed as only a "temporary title" until a better title could be found.

The portrait that hangs on the wall of Charlie's room to the right of her door is one drawn by Willy Pogany of actress Mary Philbin, who was a leading lady at Universal just 20 years before.

Hume Cronyn's film debut.

Hitchcock wanted William Powell to play Uncle Charlie, but MGM refused to lend the actor for the film. So the role went to Joseph Cotten.

Uncle Charlie arrived in Santa Rosa on August 22 or 23, 1942: the headlines in the paper were "Brazil Declares War", which had happened on August 22. However, there are also two clues that point to the film being set in pre-Pearl Harbor America (prior to Dec. 7, 1941, when the Japanese attacked the United States in the Pacific, bringing the U.S. into World War II). In the first dinner scene after Uncle Charlie's arrival, he presents gifts to the Newton family, including a pair of photos of their parents to Mrs. Newton, his sister. She remarks that the photos were made in 1888, and her son exclaims "Fifty-three years ago!" That would make the year 1941, not 1942. Also, when Uncle Charlie and his niece visit her father's bank, there's a sign on a teller's cage urging customers to "Buy Defense Bonds!" U.S. government bonds were renamed "War Bonds" after Dec. 7, 1941; "Defense Bonds" were sold prior to that date. The "Brazil Declares War" headline probably reflects a news story contemporary with the shooting of the movie, but it's in the wrong time frame for the action of the story itself.

The area shown after the Pulaski Skyway is known as the Ironbound section of Newark, NJ, which has also been used for location shots in Wise Guys and _War of The Worlds (2005)_.

"Lux Radio Theater" broadcast a 60 minute radio adaptation of the movie on January 3, 1944 with Teresa Wright reprising her film role.

"The Screen Guild Theater" broadcast a 30 minute radio adaptation of the movie on June 21, 1948 with Joseph Cotten again reprising his film role.