Can demand drafts can be corrected?

It depends on who is doing the correction. As customers neither the person who took the draft and nor the person who received it can make any corrections on the draft. Doing so would render the draft invalid and worthless. Bank officials however can make corrections to the draft if any detail is found to be incorrect. They usually cancel the old draft and re-print a new one or make the change and countersign it and seal it to ensure its legality.