The  Rebuttal: Debunking the Conspiracy Theorists
1.2 Why do flags flutter in Apollo pictures / films if there is no atmosphere on the Moon?
 
üOf course a flag can wave in a vacuum!
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üThe flags were mounted on one side of a vertical pole and had a horizontal bar attached to the top of the flag so that it would stand out from the vertical pole.
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üIn a vacuum or not, when you move the vertical pole, the flag will wave since it is attached at the top.
It isn’t air that is moving the flag, it is the cloth itself that is moving.