What is the palpable and overriding error of a judge at the Court of Appeal?

An error is said to be palpable if it is clear or obvious. An error is overriding if, in the context of the whole case, it is so serious as to be determinative when assessing the balance of probabilities with respect to that particular factual issue. Thus, invoking the "palpable and overriding error" standard recognizes that a high degree of deference is paid on appeal to findings of fact at trial. See, for example, Housen, supra, at ¶ 1‑5 and Delgamuukw v. British Columbia, 1997 CanLII 302 (SCC), [1997] 3 S.C.R. 1010, at ¶ 78 and 80. Not every misapprehension of the evidence or every error of fact by the trial judge will justify appellate intervention. The error must not only be plainly seen, but ‘overriding and determinative.’