Top: SDSS spectrum of a representative misidentified source (Plate 9174, MJD 58070, Fiber 876) classified as a z = 6.48 quasar, but identified by the Q. Wu & Y. Shen (2022) catalog as a low-redshift AGN at Z_FIT = 0.385. Bottom: Z_SYS from Q. Wu & Y. Shen (2022) versus the DR16Q pipeline redshift Z_DR16Q for all 655 sources at z  >  5. The dashed line denotes the 1:1 locus.