California Code, Code of Civil Procedure - CCP § 1294.2

The appeal shall be taken in the same manner as an appeal from an order or judgment in a civil action. Upon an appeal from any order or judgment under this title, the court may review the decision and any intermediate ruling, proceeding, order or decision which involves the merits or necessarily affects the order or judgment appealed from, or which substantially affects the rights of a party. The court may also on such appeal review any order on motion for a new trial. The respondent on the appeal, or party in whose favor the judgment or order was given may, without appealing from such judgment, request the court to and it may review any of the foregoing matters for the purpose of determining whether or not the appellant was prejudiced by the error or errors upon which he relies for reversal or modification of the judgment or order from which the appeal is taken. The provisions of this section do not authorize the court to review any decision or order from which an appeal might have been taken.