Is a superior court bound by rule that it must review the entire administrative record to determine whether an agency committed errors of law?

We first observe and all parties seem to agree, as do we, that the superior court in a case such as this is bound by the rule that it must "review the entire administrative record to determine whether the findings are supported by substantial evidence and whether the agency committed any errors of law, but the trial court need not look beyond that whole record of the administrative proceedings." (Bixby v. Pierno (1971) 4 Cal.3d 130, 144, 93 Cal.Rptr. 234, 481 P.2d 242; our emphasis.)