Continuity mistake: There is a "No Riders" sign that keeps appearing and disappearing on the window of the jeep, from one scene to another, fron shot to shot, throughout the entire film.
It Conquered the World (1956)
1 continuity mistake - chronological order
Directed by: Roger Corman
Starring: Lee Van Cleef, Peter Graves, Beverly Garland, Sally Fraser
Revealing mistake: The alien is starting to mess with all sorts of mechanical and electronic devices. One of the first ill-effects shown is a large industrial cable reel that is dangling in midair when the mechanical arm lifting it is paralyzed. Problem is, you can see the operator has his hand on the controls and is stopping the crane himself using the lever, nothing alien about that. (00:14:50)
Claire Anderson: He speaks! The zombie speaks.