In the beginning in the courtroom, the Cosmopolitan magazine edition that Mary is reading differs between the long and closeup shots. The edition she reads in long shots is the February, 1933 edition and in closeups, she reads the May, 1933 edition.
Angelo calls the little dog he is carrying Queenie and tells her to be a good girl. When Bunny appears, she takes the dog, fusses over it, and calls it a "good boy."
In a newspaper want ad, unencumbered is misspelled as "unincumbered."
After Tom gets Sam out of the chair at the club, checks his coat and hat, and walks him to the stairs, the boom microphone is clearly visible - reflected in a mirror, upper right of the frame.