I looked for this and it's definatly there. The scene is when they are talking about Harry's scar hurting after the night in the forest with the unicorns and Ron suggests he sees the nurse but Harry says it's a warning. (Then they go to talk to Hagrid about Fluffy and he accidently tells them that you just have to play music.) The shot in which they are walking all together are all talking and you can clearly see Hermione mouthing the last word of Harry's line which is "pockets" and the next line too.
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