An array of additional informative sources regarding the numerous changes made to the Original Trilogy films over the years has been added to the first post of the first page of this quality, comprehensive and insightful thread (with kind permission of doubleofive).
This thread will be also soon be pinned to the top of the ‘Theatrical Cuts vs. Subsequent Releases’ section - as the main reference point and discussion thread for the copious changes made to these beloved films.