The slip rule cannot be invoked to add a costs order to an authenticated judgment where the failure to seek costs was afterthought rather than oversight. A party who never intended to seek costs and only later realised they might be entitled to them has not established the error, slip, oversight or omission required by the rule. Even where the slip rule is technically available, the court retains a discretion to refuse costs having regard to the applicant's conduct, including adverse credibility findings at trial and the conduct giving rise to the prosecution.
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