Funny thing is the movie just makes the art world seem even sillier.
So you have people that become obsessed with chasing a "forger" who hands out fake paintings for nothing... If the paintings are good enough to fool the supposed experts then what difference does it make? He isn't doing it for money... if anything he is actually providing more opportunities for people to see works of art... whether they are real or not doesn't matter.
Even more telling is they have an art expert that admits that the original artist would often paint multiple copies of the same thing, which really means that those copies are no different than the forgeries, they are just copies of the original... so doesn't that mean the art world is just being silly?