Except as hereinafter provided, the effective date of a statement of record, or any amendment thereto, shall be the thirtieth day after the filing thereof or such earlier date as the Director may determine, having due regard to the public interest and the protection of purchasers. If any amendment to any such statement is filed prior to the effective date of the statement, the statement shall be deemed to have been filed when such amendment was filed; except that such an amendment filed with the consent of the Director, or filed pursuant to an order of the Director, shall be treated as being filed as of the date of the filing of the statement of record. When a developer records additional lands to be offered for disposition, he may consolidate the subsequent statement of record with any earlier recording offering subdivided land for disposition under the same promotional plan. At the time of consolidation the developer shall include in the consolidated statement of record any material changes in the information contained in the earlier statement.