Here is how I look at unfinished nodes:
firstly I explore sometimes which nodes belong to a street or building, sportfield, canal, graveyard, school, church, massive building or other ‘objects’
Second I always look at finished and unfinished streets and see then the unfinished nodes when I have run. Most of them I understand but sometimes there are unexpected things like 2 streets with the same name or nodes in the water, buildings etc. Thats gives me an understanding of the nodes versus streets.
When i have finished my city (and that will be ahwile with > 6000 streets I will eventually be looking at unfinished stees, nodes, impossible objects and impossivle nodes and flag them or maybe ‘bushwalk’ some 
my 0,02 cts