Also Billy Boyd pointed out in the commentary that his Indiana Jones trick of getting the palantir was unscripted and he just asked if we could switch it with the pitcher, and "they just happened to have" a Hobbit scale of that pitcher. But look at the pitcher Pippin uses to pour Gandalf a glass of water in Minas Tirith. It's the same pitcher. That's why they had a Hobbit scale of it.
I guess Pippin and Gandalf decided they had already had such great times with the pitcher that they brought it with them from Edoras.
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