Not really sure how to describe them past that really. When using Project All on complicated areas, it can still produce these little artifacts where it was confused what to do with a given vertex and drag it out to a nearby surface by accident. Generally I find the best way to iron them out (past optimizing the project settings of course) is to isolate them and use smooth to push them back into place. But is here any sort of faster way to detect and correct such artifacts? Or possibly a script?
And I only mean those sorts of very tiny spikes, not those massive ones from when something fails to resolve properly with the mesh and entire regions of it end up collapsed.