Ray Milland wore the same hat and suit throughout the film, while Audrey Totter had 21 changes of wardrobe.
Ray Milland claimed in a 1970s interview that John Farrow had let him direct one scene, his first try at directing.
The waterfront bar was a re-creation of San Francisco Bay's historic Heinhold's First and Last Chance Saloon. This authentic location lives in Jack London Square on the waterfront of Oakland.
Director John Farrow had assembled a complete cut of the film except for the final fade-out shot. After the scene was finished, he was able to preview the entire film just one hour later.
Shot in 26 days.