Harry Potter and the Half-Blood Prince

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Revealing mistake: It is not what is seen here that is the problem, but what we don't see on the Hogwarts Express; first on the way to Hogwarts when Harry, Ron, and Hermione are in their compartment talking about Draco, and second, during holiday break, when Harry and Ron are talking about Unbreakable Vows. As the camera faces the large compartment window, we see the scenery out the window, but as the train speeds along, the scenic reflection of the windows opposite it, in the corridor, should be seen but isn't. What is reflected is the light colored wall of the compartment beneath the blacked-out window. The camera filming the shots from this angle is positioned at that window, and to hide the camera/crews' outline, the window was covered.

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Harry Potter and the Half-Blood Prince mistake picture

Revealing mistake: During Quidditch tryouts, when Ron blocks the Quaffle with his head in the closeup, Ron's body disappears at the bottom of the screen below the digital editing line. (Only visible on fullscreen DVD).

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Revealing mistake: Harry and Dumbledore apparate onto Professor Slughorn's street, and Harry says "I just apparated, didn't I?" As Dumbledore is answering, ("Indeed. Quite successfully too, I might add.") the shot pans out. Look at Dumbledore's "burnt" hand. The green glove they used to make his hand look blackened is visible on his fingers. It is also visible when he turns and starts walking away from the camera. It is not due to the lighting, as it is not visible in the next shot as they both walk away. (00:05:15)

Revealing mistake: In the office building at the beginning of the film, the scene is located inside a meeting room of the very famous Swiss Re tower in London. But at the same time, the camera shows the Swiss Re tower through the window. (00:01:20)

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Revealing mistake: Immediately after Katie is cursed by the necklace, Harry, Ron and Hermione are in Mcgonagall's office talking about what they saw in Hogsmeade. Harry says, "It was Malfoy." As both teachers turn Mcgonagall says,"That is a very serious accusation, Potter." As she says this, she looks oddly transparent. You can see the window pane design through her robes, particularly in the shoulder. This continues to be true until she says "I suggest you go back to your dormitories." This could possibly signify a green or blue screen behind them. (00:54:10 - 00:54:40)

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Suggested correction: She's not transparent. It's a trick of the camera. A glare from the bright window behind her. You notice you can't see the vertical slats of the windowpane. Only the horizontal. That's because the glare is carrying across her body horizontally and where the horizontal slats are there's no light to cause a glare.

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I can see the horizontal and vertical ones through both McGonagall and Snape. I can even see the desk through the middle of her body.

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