Trivia: Domhnall Gleeson, who plays Bill Weasley, is the son of actor Brendon Gleeson (Mad-Eye Moody).
Trivia: The scene where Harry, Ron, and Hermione jump into the fireplace to escape from the Ministry was the very last scene to be filmed for the Harry Potter film series.
Trivia: Sophie Thompson, who plays Mafalda Hopkirk, the Ministry of Magic employee that Hermione impersonates using polyjuice potion, is the sister of Emma Thompson, who plays Professor Trelawney in the series.
Trivia: This was the first of the Harry Potter movies to have JK Rowling as a producer.
Chosen answer: It's explained a little more in the book. Hermione swiped Mad-Eye Moody's stock of the potion when Mrs. Weasley wasn't looking. And it's possible that, when they ran low, she simply replicated it with a Doubling Charm.
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