Since the Credit thing seems to be an opening day variation, starting to look at the variations relevant to this thread:
1977 Dolby Stereo : (mthr) 2006 / 1977 Mono Mix : (DVD) SE-Flunk: (TV Broadcast)
*EDIT*
This list is just going from the 2006 DVD version to the Flunk SE version. (but definitely note that there were most likely two credits available opening day)
SWSE Credits Rev 01: add 'Executive Producer GEORGE LUCAS'
SWSE Credits Rev 02: add commas and 'JAMES EARL JONES as the voice of Darth Vader'
SWSE Credits Rev 03: move CAST above PANAVISION, TECHNICOLOR, DELUXE & DOLBY SYSTEM Logo
SWSE Credits Rev 04: add 'Voice of Darth Vader JAMES EARL JONES'
SWSE Credits Rev 05: add 'SPECIAL EDITION' names and organizations
SWSE Credits Rev 06: shrink 'DOLBY SYSTEMS' Logo
SWSE Credits Rev 07: add A LUCASFILM LTD. PRODUCTION
SWSE Credits Rev 08: move 'Ownership...' clause
SWSE Credits Rev 09: add 'Special Edition Soundtrack available on RCAVICTOR
SWSE Credits Rev 10: add 'Novelization available from Ballantine Books'
SWSE Credits Rev 11: add 'copyright symbol 1997 LUCASFILM LTD.'
SWSE Credits Rev 12: remove 'Approved' from MPAA Logo which is now Registered. Film No. 24925 remains the same
SWSE Credits Rev 13: add 'Mixed & Recorded in a THX Sound System Theatre
SWSE Credits Rev 14: add 'Sony Dynamic Digital Sound' Logo
SWSE Credits Rev 15: add 'Dolby Digital' Logo
SWSE Credits Rev 16: add 'DTS Stereo' Logo
SWSE Credits Rev 17: add 'Please call 1-800-PHONE-THX' message & Quality assurance information
*EDIT*
Missed one: rev 'Special Dialogue & Sound Effects' to 'Special Dialogue and Sound Effects'