If you need any info on Video’s of Star Wars this is a great site to check out
http://www.davisdvd.com/misc/ep4.htm
Mod Edit: working links can be found below:-
SW: https://web.archive.org/web/20060206031246/http://www.davisdvd.com/misc/ep4.htm
ESB: https://web.archive.org/web/20050924185548/http://www.davisdvd.com/misc/ep5.htm
ROTJ: https://web.archive.org/web/20050924185726/http://www.davisdvd.com/misc/ep6.htm
Misc: https://web.archive.org/web/20060206024552/http://www.davisdvd.com/misc/ep_misc.htm