If these dishes were not precisely aligned- in other words, pointed directly at the moon, the signal would be lost. Of the pictures taken, thousands of photos and hours of film were released to the public. Those pictures have been studied, published, republished, studied again, and broadcast around the World. Of the samples, thousands of geologists and specialists quite literally worldwide have studied them for some thirty years. Geologists in Australia, England, France, Germany, Russia and Canada have studied them, as well as Americans from nearly every major scientific institution in America from CalTech and MIT to the U of Michigan.
Meteors get red-hot on reentry, where the surface both melts and oxidizes.
All of which is beginner's course data for a geology class, and extremely easy to prove or disprove. If you know what you're looking for. These reflectors allow a measurement from the Earth to the Moon, with an accuracy down to centimeters. When the modules returned to Earth, they were tracked on radar, again by dozens of radar installations, only a few of which were American, and splashed down near, and were recovered by, aircraft carriers that themselves crewed some 5,000 men. These people were watched basically 24 hours a day in Mission Control, by literally thousands of TV, radio and newspaper reporters.