Much of the data couldn't be plotted on the map because their addresses no longer exist for one reason or another. About 2/3 of this data is missing, so any conclusions drawn are ultimately incomplete.
Some of the georeferenced data is not accurate. There were a few instances of people being placed in Oregon, Italy, Paraguay, and South Africa. If there was a way to refine this data to make it more accurate, a better map could be produced.
The polygons for the 1972 Urban Renewal map should be redrawn. While I just traced where they were on the map, it would be more helpful if I could pinpoint exactly where their boundaries should be.
The georeferenced addresses didn't match up perfectly on the map, resulting in some areas that probably weren't properly accounted for. E Worthington Ave on the border of B5 and C13 shows a potential error.
An analytical tool such as Tableau or Neo4j could be used to make more insights in the dataset sorted by the HOLC areas.
The same process could be extrapolated to other cities to see if similar trends exist.
More data could be generated by scanning other directories from different years, although this would take a lot of work.
If possible, it would be interesting to incorporate newer maps and data, such as the Mecklenberg/Charlotte Quality of Life Explorer.