As Lisa Lanzing is loading an automatic pistol in her East Berlin hotel room, a close-up shot, her face not in the frame, shows her loading bullets into the magazine. However, the woman in the close-up shot wears a different coat, wristwatch, and ring on her left ring finger than all the other shots of Lisa in this scene.
(at around 44 mins) The German sign should be spelled "Halt! Weitergehen verboten" not wietergehen.
When seen on the end credits, Ernst's surname is Pohlman; however the note with his address shows it as Pohlmann.
If Lisa wanted to get away from her pursuer by hiding in Drake's apartment, wouldn't she be wise to not stand in full view of the open windows? All her pursuer needs to do now if walk or drive down the street and look in each window.