When Matthew is pretending to interview Anna for "Horse and Hound," you keep seeing a set of double doors behind him. At one point, the door completely changes. The handles become smaller, darker, and farther apart. The brown doorframe also becomes lighter.
I just watched the scene with my eyes glued to the doors - it is my opinion that the changes seen appeared to be a change in the lighting (which is a mistake in itself) but not a change in the doors.