At the 0:8:47 mark the boom mic or camera rig shadow moves across the pillar to the left of Basil Rathbone after he greets the butler, then another shadow moves on the wall to the right of him before he enters the doorway.
When Edward arrives, about nine minutes into the picture, he walks forward and the camera tracks backwards, and moving shadows of the boom microphone are visible on the columns and walls on either side of him before he reaches the room where the others have gathered.