Visiting Wonderly, Spade finds that she has been reading a book. In close-up, its title is shown as "The Strange Case of the Little Black Bird", with a picture of the eponymous falcon on the jacket. But in other shots, it is "Famous Criminals and their Trials" (possibly the 1926 book by Sidney Theodore Felstead), with human portraits on the jacket.
When Ruth displays the envelope while on the couch, she is shown in one shot beginning to stand up with it in her right hand. In the next shot, it has switched to her left hand.
In Spade's apartment, Ruth opens a wound on Cairo's forehead. Shortly afterward, when Cairo goes to see Gutman, there is no sign of the wound.
In the second-to-last scene, as Spade identifies killers to the police, his robe goes from being relatively neat to sloppy.
The same prop is used for the suitcase that Spade finds in Miss Wonderly's room and the suitcase which contains the falcon. The travel stickers are identical on each one.
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