"There are, of course, the classic general danger signs such as a fish-tank in the foyer, and a flagpole outside."

Flag poles are quite common in our area of the country (South) - so I don't know what the basis for something like this might be. [and it is rare to see the confederate flag outside of rural areas, we just fly 'old glory' and our state flag]. Most of the rest of your points I would agree with - but not this one.