Can some one elaborate on something for me, there was a reference that I did not get in this episode.
Van Gogh was Dutch, but Tony Curran is Scottish. Van Gogh in the story therefore speaking with a Scottish accent. The idea being that the TARDIS is "translating" his Dutch into a Scottish accent, and he upon hearing Amy's Scottish accent (similar to his) therefore assumed she was Dutch.
Since Amy is not Dutch and didn't "get it", she said "no". Rather than wanting to have to explain the whole thing to Van Gogh, the Doctor decided to keep it simple and said "yes".
I didn't notice that line, nice touch loved the story.