Revealing mistake: Whenever the astronauts are outside the module they are affected by being in a lower gravity environment. However, when inside there seems to be no effect, an example is when the helmet falls.
Apollo 18 (2011)
1 revealing mistake
Directed by: Gonzalo Lopez-Gallego
Starring: Ryan Robbins, Lloyd Owen, Michael Kopsa, Warren Christie
Factual error: When Nate dies by the alien moon rocks, his helmet visor "explodes." The visor in the film shatters like glass, but the real visors on actual spacesuits are made of polycarbonate, a plastic that does not shatter but deforms.