Errors made by characters (possibly deliberate errors by the filmmakers): When de Winter is showing the honeymoon film, he tells Mrs. de Winter "this is where I set the camera up on the tripod". However, the image they're watching zooms in (this is before the cinematographic image zooms in on the entire film-viewing scene in the movie, itself). Since the camera was on a tripod, it wouldn't have been able to zoom by itself since de Winter was posing with his wife at the time, not adjusting the camera.
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