Anachronism
A detail that does not belong to the film's period: a garment, an object, a hairstyle, an aircraft.
Why it matters in production
Models mix decades without knowing it: a pre-war cap on a child of 1963, a twin-jet ten years too early. We check every start frame against documentation, and fix in the image, not in the video. It takes time, and it is what makes the period believable.
Other names
period error
