THE PHYSICAL QUANTITIES CALCULATED FROM HMI FILTERGRAMS EXHIBIT SMALL BUT IMPORTANT SYSTEMATIC ERRORS RELATED TO THE SDO ORBITAL VELOCITY THAT SHOW UP IN LINE-OF-SIGHT (LOS) DOPPLER VELOCITY V LOS MAGNETIC FIELD M AND THE VECTOR FIELD B. RESULTS SHOW A C. 1% NOT-QUITE-LINEAR SCALE ERROR IN VELOCITY AND SOMEWHAT LARGER 24- AND 12-HOUR PERIODIC VARIATIONS IN REPORTED MAGNETIC FIELD VALUES. THOUGH SMALL THEY ARE SYSTEMATIC AND HINDER SOME ANALYSES OF SOME SOLAR QUANTITIES THAT DEPEND ON FRAME-TO-FRAME DIFFERENCES IN THE REPORTED MAGNETIC FIELD SUCH AS ENERGY AND HELICITY TRANSPORT THROUGH THE