This unpublished decision reviews a trial court's reliance on improper evidence. The case, In re Marriage of Patterson (D5 Feb. 9, 2021) No. F076753, is a good illustration of a key points of trial practice: The trial court may not rely on evidence that was not properly admitting into the record. And judicial notice will not get you there on matters of "substantial consequence" without following the statutory procedures.
The case is also a good illustration of a key point of appellate practice: Even if the trial court relies on improper evidence, that error is not reversible unless the evidence prejudiced the appellant. If there was other substantial evidence supporting the findings, as there was here, the error will be deemed harmless.