Revealing mistake: The "hand" holding the gun rotates 180 degrees while the shooter's point of view does not move. A real hand can't reproduce that motion without moving extremely close to the face.
Spellbound (1945)
1 revealing mistake - chronological order
Directed by: Alfred Hitchcock
Starring: Gregory Peck, Ingrid Bergman, Leo G. Carroll, Michael Chekhov
Continuity mistake: Immediately after the (Dali) dream sequence, when Dr. Brulov and Constance are reviewing Constance's notes, Dr. Brulov draws a pencil out of his coat pocket. Hitchcock then cuts to a close-up, and Dr. Brulov repeats the motion.
John Ballantine: Do you want ham or liverwurst?
Constance Petersen: Liverwurst.
Trivia: Hitchcock's cameo is him coming out of an elevator at the Empire State Hotel, carrying a violin case and smoking a cigarette. (00:43:00)