"Academy Award Theater" broadcast a 30 minute radio adaptation of the movie on October 30, 1946 with Cary Grant reprising his film role.
"Lux Radio Theater" broadcast a 60 minute radio adaptation of the movie on May 4, 1942 with Joan Fontaine reprising her film role.
"The Screen Guild Theater" broadcast a 30 minute radio adaptation of the movie on January 21, 1946 with Cary Grant and Nigel Bruce reprising their film roles.
"The Screen Guild Theater" broadcast a 30 minute radio adaptation of the movie on January 4, 1943 with Joan Fontaine and Nigel Bruce reprising their film roles.
"The Screen Guild Theater" broadcast a 30 minute radio adaptation of the movie on November 24, 1949 with Joan Fontaine, Cary Grant and Nigel Bruce reprising their film roles.
Alfred Hitchcock originally wanted Johnnie to be guilty, but the studio insisted that the public wouldn't accept Cary Grant as a murderer. Hitchcock's original ending had Johnny killing Lina by poisoning her milk, but then convicting himself by mailing a letter that Lina had written. Joan Fontaine said, Cary Grant "did kill me in the original cut, but at a preview, the audience simply refused to accept him as the murderer."
Alfred Hitchcock wanted an ending similar to the climax of the novel, but the studio, more concerned with Cary Grant's "heroic" image, insisted that it be changed. Writer Donald Spoto, in his biography of Hitchcock, "The Dark Side Of Genius", disputes Hitchcock's claim to have been overruled on the film's ending. Spoto claims that the first RKO treatment and memos between Hitchcock and the studio show that Hitchcock emphatically desired to make a film about a woman's fantasy life.
Alfred Hitchcock: about 45 minutes in, mailing a letter at the village post office.
Joan Fontaine liked the character of Lina in Suspicion so much that she sent Alfred Hitchcock a note after she read the novel ("Before the Fact", by Anthony Berkeley) offering to play the part for free, if necessary.
Joan Fontaine, in character as Lina, narrates the trailer on screen and speaks directly to the audience.
Joan Fontaine's performance in this movie is the only Oscar-winning performance that Alfred Hitchcock directed.
Michèle Morgan was tested for the role of Lina and Constance Worth replaced Phyllis Barry as "Mrs. Fitzpatrick."
Samson Raphaelson considered Suspicion "in many ways my best screenplay."
Despite the indecision over its ending, the film was a tremendous success, and more importantly Alfred Hitchcock had enjoyed a measure of creative freedom which he knew that he would not get at Selznick International.
In an interview with Dick Cavett, Alfred Hitchcock explained how he managed to call attention to the glass of milk containing the fatal dose of poison. He wanted it stand out so he had a glass made that contained a small battery operated light so the glass would show up in the long down the hallway shot.
In interviews, 'Alfred Hitchcock (I) said that an RKO executive ordered that all scenes in which Cary Grant appeared menacing be excised from the film. When the cutting was completed, the film ran only fifty-five minutes. The scenes were later restored, Hitchcock said, because he shot each piece of film so that there was only one way to edit them together properly.
In one draft of the script, when Johnnie realizes what was in Lina's mind, he runs away until he can "find some way to pay" his debts (both financial and moral), and joins the air force under a false name. She finds out where he's stationed and proudly watches as his plane, with his nickname for her painted on it, takes off.
In the scene where Johnnie brings a glass of milk up to Lina, Alfred Hitchcock had a light hidden in the glass to make it appear more sinister.
Johnnie calls Lina by his nickname for her, "Monkey Face", 19 times throughout the movie.
The dog in the movie is a Sealyham Terrier named "Johnnie" and Alfred Hitchcock's own dog. The main male character is also named "Johnnie" and this name was Hitch's original idea for the movie title. Alfred Hitchcock kept Sealyhams for many years. In his movie The Birds, Hitch walks out of the pet store with Sealyhams on a lead.