I reviewed addresses with 94110 and 94134 postcodes in Nominatim and Overpass Turbo and corrected addresses with those postcodes that were clearly incorrect. (Side note: Nominatim doesn't display calculated postcodes well, so a workaround is needed. More here: https://github.com/osm-search/Nominatim/issues/4079) Not many objects in 94134 have postcodes, but there were only minor errors around its edges. 94110 has many more postcodes. As well as some minor errors, I corrected an address in Oakland with a 94110 postcode, which put the calculated center of 94110 in the middle of the Bay. I'm waiting for that correction to appear in Nominatim (https://nominatim.openstreetmap.org/ui/search.html?q=94110).