Fighting invisible monsters

If you want to know why Van Gogh painted a monster at the window of the church at Auvers, why would you go to Arles (location of that café terrace) in the south of France, which he had already left when he painted the church, which is in the north?

This bothered me. I know that in the scale of things Whovian, it's a minor inconsistency, but it bothered me in a way that other things didn't. The Doctor decides to indulge Amy, who is a big Van Gogh fan by taking her not to the Van Gogh museum in Amsterdam (which has the largest collection of his work) but to the Musée d'Orsay in Paris: well, they have some fine examples too, and besides, Paris! The monster ( spoiler; as if you cared - )

At one level, this installment lost me as soon as it wheeled on Bill Nighy as a passing art expert - oh, don't get me wrong, he was wonderful, and I enjoyed the business with the bow ties. But thinking "Good grief, that's Bill Nighy" does rather throw you out of the story. Nor did I believe the 'Greatest. Artist. Evah.' judgement he was doling out. We all love our Vincent, but the assessment of his position (as gathered from a quick trawl through Google) is closer to 'greatest Dutch painter since Rembrandt' and 'one of the greatest Post-Impressionists'. Isn't that good enough? Does he have to win the Greatest Artist competition, too?

It was fun. But I'm still waiting for the Doctor to stop messing about and fix the crack in the universe.