Not a Goof!
From the goofs section: When Gloria and Detective Carlson are leaving to go to the theater, Carlson says that Gloria must come with because she is the only one who can identify Whitey Jackson (he says that she is the only one who has seen him) even though he had previously seen a photograph of Whitey Jackson.
Gloria saw him in her apartment after she stabbed the man with the scar with her knitting needles.