Multiple individually minor defects in a Crown Prosecutor's closing address — including misstatements of fact, departure from the Crown case as presented, belittling of the defence case, and expressions of personal opinion — may cumulatively cause a miscarriage of justice even where no single defect alone would be sufficient. Corrective directions by the trial judge must address not merely the factual error but also the context in which the error was made and its potential impact on the jury's reasoning. The expression of personal opinion by a Crown Prosecutor is particularly dangerous because the jury may regard the prosecutor as a figure of public authority whose opinions carry special weight.
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