Corrected entry: Alan brings in a load of boxes for a large Bang & Olufson stereo system. There is no reason to suspect he is lying about this purchase as he has just got a TV contract and a hefty income. However, the new stereo seen later in his room is a tiny one made by Alba. So not only is the stereo the wrong make, you have to question how the writers missed the obvious problem caused by the huge boxes and then the small stereo.
Corrected entry: At several points in this series, when there is a scene in the hotel lobby, keep an eye on the clock. Frequently, despite many minutes passing the clock doesn't move. This was probably done to avoid continuity errors arising from the time changing, but it actually creates one in itself.