A stay of execution will only be granted where the applicant demonstrates special circumstances and that real and substantial justice demands the stay. The applicant bears the onus to satisfy the court that an injustice would otherwise be caused. Critical to this determination is whether the applicant has reasonable prospects of success in the underlying rescission application. For rescission under rule 29(1)(a), an 'error' occurs where there is a relevant fact not brought to the court's attention which, had it been known, would have precluded the granting of the order. The mere pendency of another matter (lis alibi pendens) does not constitute such an error, as it is only a dilatory plea within the court's discretion and not an absolute bar to proceedings. A party who is present but whose opposing papers are struck out is deemed absent by operation of law, and the resulting judgment is a default judgment. A patent error under rule 29(1)(b) must be a mistake by the court itself in pronouncing its intended judgment or order, not merely the recording of procedural facts such as legal representation at a hearing.