Continuity mistake: When Harry and Hagrid are in Gringotts, Hagrid takes the letter from Professor Dumbleldore out of his pocket to give to the Head Goblin. The string it is tied with has a bow that runs from the top to bottom of the envelope, and the envelope is creased. When the Goblin takes it off Hagrid, it is a different envelope - the bow runs from left to right and the envelope is not creased. When viewed from where Harry and Hagrid are standing, the final shot of the envelope again shows it is creased.
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