R. 1:7-5. — Trial Errors

Any error or omission which does not prejudice a substantial right shall be disregarded by the trial court before, during and after trial. The trial court, however, at every stage of the action, including a timely application after trial, may notice any error of such a nature as to have been clearly capable of producing an unjust result, even though such error was not brought to its attention by a party.