When Bogart abducts Rosemary Lane, they leave in a light-colored, late 1930's cab. As the police pursue them, it changes to a black vintage car. When they arrive at the hide-out in the woods, it is a newer light-colored cab again.
When Wayne Morris discovers the murdered woman, the telephone is on the floor with the handset off the cradle. In the next scene, he picks up the same telephone to call the police. It is now on the table instead of the floor.
When Angela Merrova faints, her head falls to her left; in the close-up, her head is to her right.
The police fire into Mr. Quesne's hideout. Considering the fact that Ms. Vance is also in the hideout, they should not be firing against the possibility of hitting Ms. Vance.
When Walter "Wichita" Garrett reviews the press clippings, two of them refer to "Eugene Xavier." The rest refer to "Maurice Xavier."
Although Wayne Morris is billed as "Walter Barnett," he is called "Walter Garrett" in the film.