-1, if you wondering about the more obvious changes in the mono mix this page: http://homepage.ntlworld.com/russdawson/mono/index.htm is a good start, but I see that the added X-wing sound effects after "Lock S-foils in attack position" is missing there, that one stands out to me as a quite big change.

Another subtle difference, is in the assault on the Death Star, the line "There’s a heavy fire zone on this side." in the Dolby mixes that line gets cut off at the end due to the distorted quality applied to many of the voices.