I haven't seen Gasland and have not had the chance to independently research claims made in the film. But the gas drilling industry is concerned enough by it to lobby the Academy of Motion Pictures Arts & Sciences to disqualify the documentary from Oscar consideration.
To me, this is a misguided effort on the part of the industry. maybe they are only trying to protect their image from inaccurate allegations, but it has the appearance of confirming that they are trying to silence questions about fracking. And that is the perception people will have.