Originally Posted by Chris

What a lot of classic TV suffers from, many years later, is their producers’ aversion to using extras and other tricks to make their worlds look populated. They typically filmed on location in mid-summer at stupid o’clock in order to get completely empty streets - better for controlling the composition of the shot - but then, for reasons of budget and time constraints, didn’t artificially refill the scene with passers by, other vehicles, etc. The result is that the worlds they created tend to look flat and artificial when compared to even fairly modest modern productions which are a lot better at adding texture to the finished product.