Does the Emporis search include demolished buildings? That will add one or two to most of those cities.
To take LA as an example, the three on the SSP diagram are City Hall (presumably the Emporis one), USC Medical Center (no height listed, but the diagram has it at (~350 feet), and
Richfield Tower, 328 feet to the roof but demolished in the late 60s.
Likewise the Hudson Building is probably the Detroit discrepancy.