Continuity mistake: After Harry's vision of Arthur Weasley's attack, he has the first Occlumency lesson with Snape. The windows behind Harry have a diamond shape pattern, with horizontal and vertical divisions on the glass. In the last shot, as Snape orders Harry to focus, when the camera dramatically pans out through these windows there is only a diamond shape pattern on the glass.
Picture added & edited by Super Grover
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