Theory:Doctor Who television discontinuity and plot holes/Vincent and the Doctor


 * Why does the Doctor need to hurry Dr Black for an answer of when the picture was painted? The Doctor has a time machine, he can get to Paris any time, he doesn't need to hurry?
 * He's most probably eager to sort Vincent van Gogh out etc, and plus he doesn't want Doctor Black to ramble on with information that he probably mostly already knows.
 * In addition, he probably didn't want to take time away from the museum visitors.