Some of the claims made by mythbusters are tackled here if you read it carefully.
http://www.ufos-aliens.co.uk/cosmicapollo.html
Some claims among conspiracy theorists like "A flag cannot wave in a vacuum" are obviously flawed, but that does not mean that every claim is untrue and by the way,one does not need man on the moon to place a reflector on its surface,a robotic machine can easily do that,and several such machines have been sent to space.
The mythbusters have focused on only a few of those claims and said nothing about the other numerous claims raised by the skeptics.And what makes you think its not possible to fake something in a show like that one?