Unearthed Arcana

There is no official errata document for Unearthed Arcana. However, almost the entire book is Open Game Content [see p. 2 for details], so the Variant Rules section of the d20 SRD should incorporate any known errata.

The following notes are my own unofficial comments.

pp. 57-58, Wizard Variant: Domain Wizard: This variant is broken. Choosing to specialize in a school of magic is balanced by losing access to one or two other schools, but choosing to be a domain wizard has no drawback to balance its (narrow but still significant) benefits.