A photographer with a hand-held film camera (we see him winding on the 35 mm film) and a long telephoto lens, manages to take sharp photographs in moonlight when Ambrose greets his visitor in a VW Beetle. This is not possible: even with the fastest film available (eg Ilford Delta 3200), push-processed as if it were 6400 or 12800 ASA, an exposure of several seconds will be needed at f4 (a realistic widest aperture for a long lens). It is impossible to hand-hold a camera for several seconds and get a sharp picture, especially when the camera shake is magnified by the long lens.
Anyone who has worked with beeswax knows that the human candle that huge in the studio would take AGES to make.
On the caller ID in Barnaby's Car, Winter is shown as a DCI when he's a DS.