Clerical mistakes arise when recording or posting transactions. Omission errors occur if a transaction is completely absent from the records, for instance, if a credit sale isn't recorded. Commission errors happen when a transaction is incorrectly recorded, like debiting an incorrect account or entering the wrong figure. These errors don't impact the trial balance; however, they can result in inaccurate financial reports. Correcting and spotting these errors is essential for keeping precise accounting records.