Continuity mistake: At Hagrid's, when Harry, Ron and Hermione are there the first time in the film, there is a large birdcage, blue cup and saucer, watering can and small wood planter (with seedlings) on the windowsill. Later, when Hermione visibly throws the first stone, as the stone flies through the window the watering can and blue cup's positions differ and the wood planter and large birdcage are actually gone! When she throws the second stone they are back on the windowsill.
Picture added by Super Grover
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